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	diff --git a/.COPYING/gpl-2.0.md b/.COPYING/gpl-2.0.md
	new file mode 100644
	index 0000000..d141248
	--- /dev/null
	+++ b/.COPYING/gpl-2.0.md
	@@ -0,0 +1,361 @@
	+# GNU GENERAL PUBLIC LICENSE
	+
	+Version 2, June 1991
	+
	+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.
	+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
	+
	+ Everyone is permitted to copy and distribute verbatim copies
	+ of this license document, but changing it is not allowed.
	+
	+## Preamble
	+
	+The licenses for most software are designed to take away your freedom
	+to share and change it. By contrast, the GNU General Public License is
	+intended to guarantee your freedom to share and change free
	+software--to make sure the software is free for all its users. This
	+General Public License applies to most of the Free Software
	+Foundation's software and to any other program whose authors commit to
	+using it. (Some other Free Software Foundation software is covered by
	+the GNU Lesser General Public License instead.) You can apply it to
	+your programs, too.
	+
	+When we speak of free software, we are referring to freedom, not
	+price. Our General Public Licenses are designed to make sure that you
	+have the freedom to distribute copies of free software (and charge for
	+this service if you wish), that you receive source code or can get it
	+if you want it, that you can change the software or use pieces of it
	+in new free programs; and that you know you can do these things.
	+
	+To protect your rights, we need to make restrictions that forbid
	+anyone to deny you these rights or to ask you to surrender the rights.
	+These restrictions translate to certain responsibilities for you if
	+you distribute copies of the software, or if you modify it.
	+
	+For example, if you distribute copies of such a program, whether
	+gratis or for a fee, you must give the recipients all the rights that
	+you have. You must make sure that they, too, receive or can get the
	+source code. And you must show them these terms so they know their
	+rights.
	+
	+We protect your rights with two steps: (1) copyright the software, and
	+(2) offer you this license which gives you legal permission to copy,
	+distribute and/or modify the software.
	+
	+Also, for each author's protection and ours, we want to make certain
	+that everyone understands that there is no warranty for this free
	+software. If the software is modified by someone else and passed on,
	+we want its recipients to know that what they have is not the
	+original, so that any problems introduced by others will not reflect
	+on the original authors' reputations.
	+
	+Finally, any free program is threatened constantly by software
	+patents. We wish to avoid the danger that redistributors of a free
	+program will individually obtain patent licenses, in effect making the
	+program proprietary. To prevent this, we have made it clear that any
	+patent must be licensed for everyone's free use or not licensed at
	+all.
	+
	+The precise terms and conditions for copying, distribution and
	+modification follow.
	+
	+## TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
	+
	+0. This License applies to any program or other work which
	+contains a notice placed by the copyright holder saying it may be
	+distributed under the terms of this General Public License. The
	+"Program", below, refers to any such program or work, and a "work
	+based on the Program" means either the Program or any derivative work
	+under copyright law: that is to say, a work containing the Program or
	+a portion of it, either verbatim or with modifications and/or
	+translated into another language. (Hereinafter, translation is
	+included without limitation in the term "modification".) Each licensee
	+is addressed as "you".
	+
	+Activities other than copying, distribution and modification are not
	+covered by this License; they are outside its scope. The act of
	+running the Program is not restricted, and the output from the Program
	+is covered only if its contents constitute a work based on the Program
	+(independent of having been made by running the Program). Whether that
	+is true depends on what the Program does.
	+
	+1. You may copy and distribute verbatim copies of the Program's
	+source code as you receive it, in any medium, provided that you
	+conspicuously and appropriately publish on each copy an appropriate
	+copyright notice and disclaimer of warranty; keep intact all the
	+notices that refer to this License and to the absence of any warranty;
	+and give any other recipients of the Program a copy of this License
	+along with the Program.
	+
	+You may charge a fee for the physical act of transferring a copy, and
	+you may at your option offer warranty protection in exchange for a
	+fee.
	+
	+2. You may modify your copy or copies of the Program or any
	+portion of it, thus forming a work based on the Program, and copy and
	+distribute such modifications or work under the terms of Section 1
	+above, provided that you also meet all of these conditions:
	+
	+
	+a) You must cause the modified files to carry prominent notices
	+stating that you changed the files and the date of any change.
	+
	+
	+b) You must cause any work that you distribute or publish, that in
	+whole or in part contains or is derived from the Program or any part
	+thereof, to be licensed as a whole at no charge to all third parties
	+under the terms of this License.
	+
	+
	+c) If the modified program normally reads commands interactively
	+when run, you must cause it, when started running for such interactive
	+use in the most ordinary way, to print or display an announcement
	+including an appropriate copyright notice and a notice that there is
	+no warranty (or else, saying that you provide a warranty) and that
	+users may redistribute the program under these conditions, and telling
	+the user how to view a copy of this License. (Exception: if the
	+Program itself is interactive but does not normally print such an
	+announcement, your work based on the Program is not required to print
	+an announcement.)
	+
	+These requirements apply to the modified work as a whole. If
	+identifiable sections of that work are not derived from the Program,
	+and can be reasonably considered independent and separate works in
	+themselves, then this License, and its terms, do not apply to those
	+sections when you distribute them as separate works. But when you
	+distribute the same sections as part of a whole which is a work based
	+on the Program, the distribution of the whole must be on the terms of
	+this License, whose permissions for other licensees extend to the
	+entire whole, and thus to each and every part regardless of who wrote
	+it.
	+
	+Thus, it is not the intent of this section to claim rights or contest
	+your rights to work written entirely by you; rather, the intent is to
	+exercise the right to control the distribution of derivative or
	+collective works based on the Program.
	+
	+In addition, mere aggregation of another work not based on the Program
	+with the Program (or with a work based on the Program) on a volume of
	+a storage or distribution medium does not bring the other work under
	+the scope of this License.
	+
	+3. You may copy and distribute the Program (or a work based on it,
	+under Section 2) in object code or executable form under the terms of
	+Sections 1 and 2 above provided that you also do one of the following:
	+
	+
	+a) Accompany it with the complete corresponding machine-readable
	+source code, which must be distributed under the terms of Sections 1
	+and 2 above on a medium customarily used for software interchange; or,
	+
	+
	+b) Accompany it with a written offer, valid for at least three
	+years, to give any third party, for a charge no more than your cost of
	+physically performing source distribution, a complete machine-readable
	+copy of the corresponding source code, to be distributed under the
	+terms of Sections 1 and 2 above on a medium customarily used for
	+software interchange; or,
	+
	+
	+c) Accompany it with the information you received as to the offer
	+to distribute corresponding source code. (This alternative is allowed
	+only for noncommercial distribution and only if you received the
	+program in object code or executable form with such an offer, in
	+accord with Subsection b above.)
	+
	+The source code for a work means the preferred form of the work for
	+making modifications to it. For an executable work, complete source
	+code means all the source code for all modules it contains, plus any
	+associated interface definition files, plus the scripts used to
	+control compilation and installation of the executable. However, as a
	+special exception, the source code distributed need not include
	+anything that is normally distributed (in either source or binary
	+form) with the major components (compiler, kernel, and so on) of the
	+operating system on which the executable runs, unless that component
	+itself accompanies the executable.
	+
	+If distribution of executable or object code is made by offering
	+access to copy from a designated place, then offering equivalent
	+access to copy the source code from the same place counts as
	+distribution of the source code, even though third parties are not
	+compelled to copy the source along with the object code.
	+
	+4. You may not copy, modify, sublicense, or distribute the Program
	+except as expressly provided under this License. Any attempt otherwise
	+to copy, modify, sublicense or distribute the Program is void, and
	+will automatically terminate your rights under this License. However,
	+parties who have received copies, or rights, from you under this
	+License will not have their licenses terminated so long as such
	+parties remain in full compliance.
	+
	+5. You are not required to accept this License, since you have not
	+signed it. However, nothing else grants you permission to modify or
	+distribute the Program or its derivative works. These actions are
	+prohibited by law if you do not accept this License. Therefore, by
	+modifying or distributing the Program (or any work based on the
	+Program), you indicate your acceptance of this License to do so, and
	+all its terms and conditions for copying, distributing or modifying
	+the Program or works based on it.
	+
	+6. Each time you redistribute the Program (or any work based on
	+the Program), the recipient automatically receives a license from the
	+original licensor to copy, distribute or modify the Program subject to
	+these terms and conditions. You may not impose any further
	+restrictions on the recipients' exercise of the rights granted herein.
	+You are not responsible for enforcing compliance by third parties to
	+this License.
	+
	+7. If, as a consequence of a court judgment or allegation of
	+patent infringement or for any other reason (not limited to patent
	+issues), conditions are imposed on you (whether by court order,
	+agreement or otherwise) that contradict the conditions of this
	+License, they do not excuse you from the conditions of this License.
	+If you cannot distribute so as to satisfy simultaneously your
	+obligations under this License and any other pertinent obligations,
	+then as a consequence you may not distribute the Program at all. For
	+example, if a patent license would not permit royalty-free
	+redistribution of the Program by all those who receive copies directly
	+or indirectly through you, then the only way you could satisfy both it
	+and this License would be to refrain entirely from distribution of the
	+Program.
	+
	+If any portion of this section is held invalid or unenforceable under
	+any particular circumstance, the balance of the section is intended to
	+apply and the section as a whole is intended to apply in other
	+circumstances.
	+
	+It is not the purpose of this section to induce you to infringe any
	+patents or other property right claims or to contest validity of any
	+such claims; this section has the sole purpose of protecting the
	+integrity of the free software distribution system, which is
	+implemented by public license practices. Many people have made
	+generous contributions to the wide range of software distributed
	+through that system in reliance on consistent application of that
	+system; it is up to the author/donor to decide if he or she is willing
	+to distribute software through any other system and a licensee cannot
	+impose that choice.
	+
	+This section is intended to make thoroughly clear what is believed to
	+be a consequence of the rest of this License.
	+
	+8. If the distribution and/or use of the Program is restricted in
	+certain countries either by patents or by copyrighted interfaces, the
	+original copyright holder who places the Program under this License
	+may add an explicit geographical distribution limitation excluding
	+those countries, so that distribution is permitted only in or among
	+countries not thus excluded. In such case, this License incorporates
	+the limitation as if written in the body of this License.
	+
	+9. The Free Software Foundation may publish revised and/or new
	+versions of the General Public License from time to time. Such new
	+versions will be similar in spirit to the present version, but may
	+differ in detail to address new problems or concerns.
	+
	+Each version is given a distinguishing version number. If the Program
	+specifies a version number of this License which applies to it and
	+"any later version", you have the option of following the terms and
	+conditions either of that version or of any later version published by
	+the Free Software Foundation. If the Program does not specify a
	+version number of this License, you may choose any version ever
	+published by the Free Software Foundation.
	+
	+10. If you wish to incorporate parts of the Program into other
	+free programs whose distribution conditions are different, write to
	+the author to ask for permission. For software which is copyrighted by
	+the Free Software Foundation, write to the Free Software Foundation;
	+we sometimes make exceptions for this. Our decision will be guided by
	+the two goals of preserving the free status of all derivatives of our
	+free software and of promoting the sharing and reuse of software
	+generally.
	+
	+NO WARRANTY
	+
	+11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO
	+WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.
	+EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR
	+OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY
	+KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE
	+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
	+PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE
	+PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME
	+THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
	+
	+12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN
	+WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY
	+AND/OR REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU
	+FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR
	+CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE
	+PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING
	+RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A
	+FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF
	+SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
	+DAMAGES.
	+
	+END OF TERMS AND CONDITIONS
	+
	+## How to Apply These Terms to Your New Programs
	+
	+If you develop a new program, and you want it to be of the greatest
	+possible use to the public, the best way to achieve this is to make it
	+free software which everyone can redistribute and change under these
	+terms.
	+
	+To do so, attach the following notices to the program. It is safest to
	+attach them to the start of each source file to most effectively
	+convey the exclusion of warranty; and each file should have at least
	+the "copyright" line and a pointer to where the full notice is found.
	+
	+ one line to give the program's name and an idea of what it does.
	+ Copyright (C) yyyy name of author
	+
	+ This program is free software; you can redistribute it and/or
	+ modify it under the terms of the GNU General Public License
	+ as published by the Free Software Foundation; either version 2
	+ of the License, or (at your option) any later version.
	+
	+ This program is distributed in the hope that it will be useful,
	+ but WITHOUT ANY WARRANTY; without even the implied warranty of
	+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	+ GNU General Public License for more details.
	+
	+ You should have received a copy of the GNU General Public License
	+ along with this program; if not, write to the Free Software
	+ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
	+
	+Also add information on how to contact you by electronic and paper
	+mail.
	+
	+If the program is interactive, make it output a short notice like this
	+when it starts in an interactive mode:
	+
	+ Gnomovision version 69, Copyright (C) year name of author
	+ Gnomovision comes with ABSOLUTELY NO WARRANTY; for details
	+ type `show w'. This is free software, and you are welcome
	+ to redistribute it under certain conditions; type `show c'
	+ for details.
	+
	+The hypothetical commands \`show w' and \`show c' should show the
	+appropriate parts of the General Public License. Of course, the
	+commands you use may be called something other than \`show w' and
	+\`show c'; they could even be mouse-clicks or menu items--whatever
	+suits your program.
	+
	+You should also get your employer (if you work as a programmer) or
	+your school, if any, to sign a "copyright disclaimer" for the program,
	+if necessary. Here is a sample; alter the names:
	+
	+ Yoyodyne, Inc., hereby disclaims all copyright
	+ interest in the program `Gnomovision'
	+ (which makes passes at compilers) written
	+ by James Hacker.
	+
	+ signature of Ty Coon, 1 April 1989
	+ Ty Coon, President of Vice
	+
	+This General Public License does not permit incorporating your program
	+into proprietary programs. If your program is a subroutine library,
	+you may consider it more useful to permit linking proprietary
	+applications with the library. If this is what you want to do, use the
	+[GNU Lesser General Public
	+License](https://www.gnu.org/licenses/lgpl.html) instead of this
	+License.
	diff --git a/basic_materials_mod/gpl-3.0.md b/.COPYING/gpl-3.0.md
	similarity index 100%
	rename from basic_materials_mod/gpl-3.0.md
	rename to .COPYING/gpl-3.0.md
	diff --git a/.COPYING/lgpl-2.0.md b/.COPYING/lgpl-2.0.md
	new file mode 100644
	index 0000000..21a0d08
	--- /dev/null
	+++ b/.COPYING/lgpl-2.0.md
	@@ -0,0 +1,482 @@
	+# GNU LIBRARY GENERAL PUBLIC LICENSE
	+
	+Version 2, June 1991
	+
	+ Copyright (C) 1991 Free Software Foundation, Inc.
	+ 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
	+
	+ Everyone is permitted to copy and distribute verbatim copies
	+ of this license document, but changing it is not allowed.
	+
	+ [This is the first released version of the library GPL. It is
	+ numbered 2 because it goes with version 2 of the ordinary GPL.]
	+
	+## Preamble
	+
	+The licenses for most software are designed to take away your freedom
	+to share and change it. By contrast, the GNU General Public Licenses
	+are intended to guarantee your freedom to share and change free
	+software--to make sure the software is free for all its users.
	+
	+This license, the Library General Public License, applies to some
	+specially designated Free Software Foundation software, and to any
	+other libraries whose authors decide to use it. You can use it for
	+your libraries, too.
	+
	+When we speak of free software, we are referring to freedom, not
	+price. Our General Public Licenses are designed to make sure that you
	+have the freedom to distribute copies of free software (and charge for
	+this service if you wish), that you receive source code or can get it
	+if you want it, that you can change the software or use pieces of it
	+in new free programs; and that you know you can do these things.
	+
	+To protect your rights, we need to make restrictions that forbid
	+anyone to deny you these rights or to ask you to surrender the rights.
	+These restrictions translate to certain responsibilities for you if
	+you distribute copies of the library, or if you modify it.
	+
	+For example, if you distribute copies of the library, whether gratis
	+or for a fee, you must give the recipients all the rights that we gave
	+you. You must make sure that they, too, receive or can get the source
	+code. If you link a program with the library, you must provide
	+complete object files to the recipients so that they can relink them
	+with the library, after making changes to the library and recompiling
	+it. And you must show them these terms so they know their rights.
	+
	+Our method of protecting your rights has two steps: (1) copyright the
	+library, and (2) offer you this license which gives you legal
	+permission to copy, distribute and/or modify the library.
	+
	+Also, for each distributor's protection, we want to make certain that
	+everyone understands that there is no warranty for this free library.
	+If the library is modified by someone else and passed on, we want its
	+recipients to know that what they have is not the original version, so
	+that any problems introduced by others will not reflect on the
	+original authors' reputations.
	+
	+Finally, any free program is threatened constantly by software
	+patents. We wish to avoid the danger that companies distributing free
	+software will individually obtain patent licenses, thus in effect
	+transforming the program into proprietary software. To prevent this,
	+we have made it clear that any patent must be licensed for everyone's
	+free use or not licensed at all.
	+
	+Most GNU software, including some libraries, is covered by the
	+ordinary GNU General Public License, which was designed for utility
	+programs. This license, the GNU Library General Public License,
	+applies to certain designated libraries. This license is quite
	+different from the ordinary one; be sure to read it in full, and don't
	+assume that anything in it is the same as in the ordinary license.
	+
	+The reason we have a separate public license for some libraries is
	+that they blur the distinction we usually make between modifying or
	+adding to a program and simply using it. Linking a program with a
	+library, without changing the library, is in some sense simply using
	+the library, and is analogous to running a utility program or
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	+executable is a combined work, a derivative of the original library,
	+and the ordinary General Public License treats it as such.
	+
	+Because of this blurred distinction, using the ordinary General Public
	+License for libraries did not effectively promote software sharing,
	+because most developers did not use the libraries. We concluded that
	+weaker conditions might promote sharing better.
	+
	+However, unrestricted linking of non-free programs would deprive the
	+users of those programs of all benefit from the free status of the
	+libraries themselves. This Library General Public License is intended
	+to permit developers of non-free programs to use free libraries, while
	+preserving your freedom as a user of such programs to change the free
	+libraries that are incorporated in them. (We have not seen how to
	+achieve this as regards changes in header files, but we have achieved
	+it as regards changes in the actual functions of the Library.) The
	+hope is that this will lead to faster development of free libraries.
	+
	+The precise terms and conditions for copying, distribution and
	+modification follow. Pay close attention to the difference between a
	+"work based on the library" and a "work that uses the library". The
	+former contains code derived from the library, while the latter only
	+works together with the library.
	+
	+Note that it is possible for a library to be covered by the ordinary
	+General Public License rather than by this special one.
	+
	+## TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
	+
	+0. This License Agreement applies to any software library which
	+contains a notice placed by the copyright holder or other authorized
	+party saying it may be distributed under the terms of this Library
	+General Public License (also called "this License"). Each licensee is
	+addressed as "you".
	+
	+A "library" means a collection of software functions and/or data
	+prepared so as to be conveniently linked with application programs
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	+The "Library", below, refers to any such software library or work
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	+included without limitation in the term "modification".)
	+
	+"Source code" for a work means the preferred form of the work for
	+making modifications to it. For a library, complete source code means
	+all the source code for all modules it contains, plus any associated
	+interface definition files, plus the scripts used to control
	+compilation and installation of the library.
	+
	+Activities other than copying, distribution and modification are not
	+covered by this License; they are outside its scope. The act of
	+running a program using the Library is not restricted, and output from
	+such a program is covered only if its contents constitute a work based
	+on the Library (independent of the use of the Library in a tool for
	+writing it). Whether that is true depends on what the Library does and
	+what the program that uses the Library does.
	+
	+1. You may copy and distribute verbatim copies of the Library's
	+complete source code as you receive it, in any medium, provided that
	+you conspicuously and appropriately publish on each copy an
	+appropriate copyright notice and disclaimer of warranty; keep intact
	+all the notices that refer to this License and to the absence of any
	+warranty; and distribute a copy of this License along with the
	+Library.
	+
	+You may charge a fee for the physical act of transferring a copy, and
	+you may at your option offer warranty protection in exchange for a
	+fee.
	+
	+2. You may modify your copy or copies of the Library or any
	+portion of it, thus forming a work based on the Library, and copy and
	+distribute such modifications or work under the terms of Section 1
	+above, provided that you also meet all of these conditions:
	+
	+- a) The modified work must itself be a software library.
	+- b) You must cause the files modified to carry prominent
	+ notices stating that you changed the files and the date of
	+ any change.
	+- c) You must cause the whole of the work to be licensed at no
	+ charge to all third parties under the terms of this License.
	+- d) If a facility in the modified Library refers to a function
	+ or a table of data to be supplied by an application program that
	+ uses the facility, other than as an argument passed when the
	+ facility is invoked, then you must make a good faith effort to
	+ ensure that, in the event an application does not supply such
	+ function or table, the facility still operates, and performs
	+ whatever part of its purpose remains meaningful.
	+
	+ (For example, a function in a library to compute square roots has
	+ a purpose that is entirely well-defined independent of
	+ the application. Therefore, Subsection 2d requires that any
	+ application-supplied function or table used by this function must
	+ be optional: if the application does not supply it, the square
	+ root function must still compute square roots.)
	+
	+These requirements apply to the modified work as a whole. If
	+identifiable sections of that work are not derived from the Library,
	+and can be reasonably considered independent and separate works in
	+themselves, then this License, and its terms, do not apply to those
	+sections when you distribute them as separate works. But when you
	+distribute the same sections as part of a whole which is a work based
	+on the Library, the distribution of the whole must be on the terms of
	+this License, whose permissions for other licensees extend to the
	+entire whole, and thus to each and every part regardless of who wrote
	+it.
	+
	+Thus, it is not the intent of this section to claim rights or contest
	+your rights to work written entirely by you; rather, the intent is to
	+exercise the right to control the distribution of derivative or
	+collective works based on the Library.
	+
	+In addition, mere aggregation of another work not based on the Library
	+with the Library (or with a work based on the Library) on a volume of
	+a storage or distribution medium does not bring the other work under
	+the scope of this License.
	+
	+3. You may opt to apply the terms of the ordinary GNU General
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	diff --git a/basic_materials_mod/lgpl-3.0.md b/.COPYING/lgpl-3.0.md
	similarity index 100%
	rename from basic_materials_mod/lgpl-3.0.md
	rename to .COPYING/lgpl-3.0.md
	diff --git a/default_mod/lgpl-2.1.txt b/default_mod/lgpl-2.1.txt
	deleted file mode 100644
	index e5ab03e..0000000
	--- a/default_mod/lgpl-2.1.txt
	+++ /dev/null
	@@ -1,502 +0,0 @@
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	-That's all there is to it!
	diff --git a/signs_lib_mod/gpl-3.0.md b/signs_lib_mod/gpl-3.0.md
	deleted file mode 100644
	index 496acdb..0000000
	--- a/signs_lib_mod/gpl-3.0.md
	+++ /dev/null
	@@ -1,675 +0,0 @@
	-# GNU GENERAL PUBLIC LICENSE
	-
	-Version 3, 29 June 2007
	-
	-Copyright (C) 2007 Free Software Foundation, Inc.
	-<https://fsf.org/>
	-
	-Everyone is permitted to copy and distribute verbatim copies of this
	-license document, but changing it is not allowed.
	-
	-## Preamble
	-
	-The GNU General Public License is a free, copyleft license for
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	-The licenses for most software and other practical works are designed
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	-## TERMS AND CONDITIONS
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	-recipient, or for the User Product in which it has been modified or
	-installed. Access to a network may be denied when the modification
	-itself materially and adversely affects the operation of the network
	-or violates the rules and protocols for communication across the
	-network.
	-
	-Corresponding Source conveyed, and Installation Information provided,
	-in accord with this section must be in a format that is publicly
	-documented (and with an implementation available to the public in
	-source code form), and must require no special password or key for
	-unpacking, reading or copying.
	-
	-### 7. Additional Terms.
	-
	-"Additional permissions" are terms that supplement the terms of this
	-License by making exceptions from one or more of its conditions.
	-Additional permissions that are applicable to the entire Program shall
	-be treated as though they were included in this License, to the extent
	-that they are valid under applicable law. If additional permissions
	-apply only to part of the Program, that part may be used separately
	-under those permissions, but the entire Program remains governed by
	-this License without regard to the additional permissions.
	-
	-When you convey a copy of a covered work, you may at your option
	-remove any additional permissions from that copy, or from any part of
	-it. (Additional permissions may be written to require their own
	-removal in certain cases when you modify the work.) You may place
	-additional permissions on material, added by you to a covered work,
	-for which you have or can give appropriate copyright permission.
	-
	-Notwithstanding any other provision of this License, for material you
	-add to a covered work, you may (if authorized by the copyright holders
	-of that material) supplement the terms of this License with terms:
	-
	-- a) Disclaiming warranty or limiting liability differently from the
	- terms of sections 15 and 16 of this License; or
	-- b) Requiring preservation of specified reasonable legal notices or
	- author attributions in that material or in the Appropriate Legal
	- Notices displayed by works containing it; or
	-- c) Prohibiting misrepresentation of the origin of that material,
	- or requiring that modified versions of such material be marked in
	- reasonable ways as different from the original version; or
	-- d) Limiting the use for publicity purposes of names of licensors
	- or authors of the material; or
	-- e) Declining to grant rights under trademark law for use of some
	- trade names, trademarks, or service marks; or
	-- f) Requiring indemnification of licensors and authors of that
	- material by anyone who conveys the material (or modified versions
	- of it) with contractual assumptions of liability to the recipient,
	- for any liability that these contractual assumptions directly
	- impose on those licensors and authors.
	-
	-All other non-permissive additional terms are considered "further
	-restrictions" within the meaning of section 10. If the Program as you
	-received it, or any part of it, contains a notice stating that it is
	-governed by this License along with a term that is a further
	-restriction, you may remove that term. If a license document contains
	-a further restriction but permits relicensing or conveying under this
	-License, you may add to a covered work material governed by the terms
	-of that license document, provided that the further restriction does
	-not survive such relicensing or conveying.
	-
	-If you add terms to a covered work in accord with this section, you
	-must place, in the relevant source files, a statement of the
	-additional terms that apply to those files, or a notice indicating
	-where to find the applicable terms.
	-
	-Additional terms, permissive or non-permissive, may be stated in the
	-form of a separately written license, or stated as exceptions; the
	-above requirements apply either way.
	-
	-### 8. Termination.
	-
	-You may not propagate or modify a covered work except as expressly
	-provided under this License. Any attempt otherwise to propagate or
	-modify it is void, and will automatically terminate your rights under
	-this License (including any patent licenses granted under the third
	-paragraph of section 11).
	-
	-However, if you cease all violation of this License, then your license
	-from a particular copyright holder is reinstated (a) provisionally,
	-unless and until the copyright holder explicitly and finally
	-terminates your license, and (b) permanently, if the copyright holder
	-fails to notify you of the violation by some reasonable means prior to
	-60 days after the cessation.
	-
	-Moreover, your license from a particular copyright holder is
	-reinstated permanently if the copyright holder notifies you of the
	-violation by some reasonable means, this is the first time you have
	-received notice of violation of this License (for any work) from that
	-copyright holder, and you cure the violation prior to 30 days after
	-your receipt of the notice.
	-
	-Termination of your rights under this section does not terminate the
	-licenses of parties who have received copies or rights from you under
	-this License. If your rights have been terminated and not permanently
	-reinstated, you do not qualify to receive new licenses for the same
	-material under section 10.
	-
	-### 9. Acceptance Not Required for Having Copies.
	-
	-You are not required to accept this License in order to receive or run
	-a copy of the Program. Ancillary propagation of a covered work
	-occurring solely as a consequence of using peer-to-peer transmission
	-to receive a copy likewise does not require acceptance. However,
	-nothing other than this License grants you permission to propagate or
	-modify any covered work. These actions infringe copyright if you do
	-not accept this License. Therefore, by modifying or propagating a
	-covered work, you indicate your acceptance of this License to do so.
	-
	-### 10. Automatic Licensing of Downstream Recipients.
	-
	-Each time you convey a covered work, the recipient automatically
	-receives a license from the original licensors, to run, modify and
	-propagate that work, subject to this License. You are not responsible
	-for enforcing compliance by third parties with this License.
	-
	-An "entity transaction" is a transaction transferring control of an
	-organization, or substantially all assets of one, or subdividing an
	-organization, or merging organizations. If propagation of a covered
	-work results from an entity transaction, each party to that
	-transaction who receives a copy of the work also receives whatever
	-licenses to the work the party's predecessor in interest had or could
	-give under the previous paragraph, plus a right to possession of the
	-Corresponding Source of the work from the predecessor in interest, if
	-the predecessor has it or can get it with reasonable efforts.
	-
	-You may not impose any further restrictions on the exercise of the
	-rights granted or affirmed under this License. For example, you may
	-not impose a license fee, royalty, or other charge for exercise of
	-rights granted under this License, and you may not initiate litigation
	-(including a cross-claim or counterclaim in a lawsuit) alleging that
	-any patent claim is infringed by making, using, selling, offering for
	-sale, or importing the Program or any portion of it.
	-
	-### 11. Patents.
	-
	-A "contributor" is a copyright holder who authorizes use under this
	-License of the Program or a work on which the Program is based. The
	-work thus licensed is called the contributor's "contributor version".
	-
	-A contributor's "essential patent claims" are all patent claims owned
	-or controlled by the contributor, whether already acquired or
	-hereafter acquired, that would be infringed by some manner, permitted
	-by this License, of making, using, or selling its contributor version,
	-but do not include claims that would be infringed only as a
	-consequence of further modification of the contributor version. For
	-purposes of this definition, "control" includes the right to grant
	-patent sublicenses in a manner consistent with the requirements of
	-this License.
	-
	-Each contributor grants you a non-exclusive, worldwide, royalty-free
	-patent license under the contributor's essential patent claims, to
	-make, use, sell, offer for sale, import and otherwise run, modify and
	-propagate the contents of its contributor version.
	-
	-In the following three paragraphs, a "patent license" is any express
	-agreement or commitment, however denominated, not to enforce a patent
	-(such as an express permission to practice a patent or covenant not to
	-sue for patent infringement). To "grant" such a patent license to a
	-party means to make such an agreement or commitment not to enforce a
	-patent against the party.
	-
	-If you convey a covered work, knowingly relying on a patent license,
	-and the Corresponding Source of the work is not available for anyone
	-to copy, free of charge and under the terms of this License, through a
	-publicly available network server or other readily accessible means,
	-then you must either (1) cause the Corresponding Source to be so
	-available, or (2) arrange to deprive yourself of the benefit of the
	-patent license for this particular work, or (3) arrange, in a manner
	-consistent with the requirements of this License, to extend the patent
	-license to downstream recipients. "Knowingly relying" means you have
	-actual knowledge that, but for the patent license, your conveying the
	-covered work in a country, or your recipient's use of the covered work
	-in a country, would infringe one or more identifiable patents in that
	-country that you have reason to believe are valid.
	-
	-If, pursuant to or in connection with a single transaction or
	-arrangement, you convey, or propagate by procuring conveyance of, a
	-covered work, and grant a patent license to some of the parties
	-receiving the covered work authorizing them to use, propagate, modify
	-or convey a specific copy of the covered work, then the patent license
	-you grant is automatically extended to all recipients of the covered
	-work and works based on it.
	-
	-A patent license is "discriminatory" if it does not include within the
	-scope of its coverage, prohibits the exercise of, or is conditioned on
	-the non-exercise of one or more of the rights that are specifically
	-granted under this License. You may not convey a covered work if you
	-are a party to an arrangement with a third party that is in the
	-business of distributing software, under which you make payment to the
	-third party based on the extent of your activity of conveying the
	-work, and under which the third party grants, to any of the parties
	-who would receive the covered work from you, a discriminatory patent
	-license (a) in connection with copies of the covered work conveyed by
	-you (or copies made from those copies), or (b) primarily for and in
	-connection with specific products or compilations that contain the
	-covered work, unless you entered into that arrangement, or that patent
	-license was granted, prior to 28 March 2007.
	-
	-Nothing in this License shall be construed as excluding or limiting
	-any implied license or other defenses to infringement that may
	-otherwise be available to you under applicable patent law.
	-
	-### 12. No Surrender of Others' Freedom.
	-
	-If conditions are imposed on you (whether by court order, agreement or
	-otherwise) that contradict the conditions of this License, they do not
	-excuse you from the conditions of this License. If you cannot convey a
	-covered work so as to satisfy simultaneously your obligations under
	-this License and any other pertinent obligations, then as a
	-consequence you may not convey it at all. For example, if you agree to
	-terms that obligate you to collect a royalty for further conveying
	-from those to whom you convey the Program, the only way you could
	-satisfy both those terms and this License would be to refrain entirely
	-from conveying the Program.
	-
	-### 13. Use with the GNU Affero General Public License.
	-
	-Notwithstanding any other provision of this License, you have
	-permission to link or combine any covered work with a work licensed
	-under version 3 of the GNU Affero General Public License into a single
	-combined work, and to convey the resulting work. The terms of this
	-License will continue to apply to the part which is the covered work,
	-but the special requirements of the GNU Affero General Public License,
	-section 13, concerning interaction through a network will apply to the
	-combination as such.
	-
	-### 14. Revised Versions of this License.
	-
	-The Free Software Foundation may publish revised and/or new versions
	-of the GNU General Public License from time to time. Such new versions
	-will be similar in spirit to the present version, but may differ in
	-detail to address new problems or concerns.
	-
	-Each version is given a distinguishing version number. If the Program
	-specifies that a certain numbered version of the GNU General Public
	-License "or any later version" applies to it, you have the option of
	-following the terms and conditions either of that numbered version or
	-of any later version published by the Free Software Foundation. If the
	-Program does not specify a version number of the GNU General Public
	-License, you may choose any version ever published by the Free
	-Software Foundation.
	-
	-If the Program specifies that a proxy can decide which future versions
	-of the GNU General Public License can be used, that proxy's public
	-statement of acceptance of a version permanently authorizes you to
	-choose that version for the Program.
	-
	-Later license versions may give you additional or different
	-permissions. However, no additional obligations are imposed on any
	-author or copyright holder as a result of your choosing to follow a
	-later version.
	-
	-### 15. Disclaimer of Warranty.
	-
	-THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
	-APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
	-HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT
	-WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT
	-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	-A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND
	-PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE
	-DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR
	-CORRECTION.
	-
	-### 16. Limitation of Liability.
	-
	-IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
	-WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR
	-CONVEYS THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
	-INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES
	-ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT
	-NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR
	-LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM
	-TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER
	-PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
	-
	-### 17. Interpretation of Sections 15 and 16.
	-
	-If the disclaimer of warranty and limitation of liability provided
	-above cannot be given local legal effect according to their terms,
	-reviewing courts shall apply local law that most closely approximates
	-an absolute waiver of all civil liability in connection with the
	-Program, unless a warranty or assumption of liability accompanies a
	-copy of the Program in return for a fee.
	-
	-END OF TERMS AND CONDITIONS
	-
	-## How to Apply These Terms to Your New Programs
	-
	-If you develop a new program, and you want it to be of the greatest
	-possible use to the public, the best way to achieve this is to make it
	-free software which everyone can redistribute and change under these
	-terms.
	-
	-To do so, attach the following notices to the program. It is safest to
	-attach them to the start of each source file to most effectively state
	-the exclusion of warranty; and each file should have at least the
	-"copyright" line and a pointer to where the full notice is found.
	-
	- <one line to give the program's name and a brief idea of what it does.>
	- Copyright (C) <year> <name of author>
	-
	- This program is free software: you can redistribute it and/or modify
	- it under the terms of the GNU General Public License as published by
	- the Free Software Foundation, either version 3 of the License, or
	- (at your option) any later version.
	-
	- This program is distributed in the hope that it will be useful,
	- but WITHOUT ANY WARRANTY; without even the implied warranty of
	- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	- GNU General Public License for more details.
	-
	- You should have received a copy of the GNU General Public License
	- along with this program. If not, see <https://www.gnu.org/licenses/>.
	-
	-Also add information on how to contact you by electronic and paper
	-mail.
	-
	-If the program does terminal interaction, make it output a short
	-notice like this when it starts in an interactive mode:
	-
	- <program> Copyright (C) <year> <name of author>
	- This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
	- This is free software, and you are welcome to redistribute it
	- under certain conditions; type `show c' for details.
	-
	-The hypothetical commands \`show w' and \`show c' should show the
	-appropriate parts of the General Public License. Of course, your
	-program's commands might be different; for a GUI interface, you would
	-use an "about box".
	-
	-You should also get your employer (if you work as a programmer) or
	-school, if any, to sign a "copyright disclaimer" for the program, if
	-necessary. For more information on this, and how to apply and follow
	-the GNU GPL, see <https://www.gnu.org/licenses/>.
	-
	-The GNU General Public License does not permit incorporating your
	-program into proprietary programs. If your program is a subroutine
	-library, you may consider it more useful to permit linking proprietary
	-applications with the library. If this is what you want to do, use the
	-GNU Lesser General Public License instead of this License. But first,
	-please read <https://www.gnu.org/licenses/why-not-lgpl.html>.
	diff --git a/signs_lib_mod/lgpl-3.0.md b/signs_lib_mod/lgpl-3.0.md
	deleted file mode 100644
	index 6fb6a01..0000000
	--- a/signs_lib_mod/lgpl-3.0.md
	+++ /dev/null
	@@ -1,157 +0,0 @@
	-# GNU LESSER GENERAL PUBLIC LICENSE
	-
	-Version 3, 29 June 2007
	-
	-Copyright (C) 2007 Free Software Foundation, Inc.
	-<https://fsf.org/>
	-
	-Everyone is permitted to copy and distribute verbatim copies of this
	-license document, but changing it is not allowed.
	-
	-This version of the GNU Lesser General Public License incorporates the
	-terms and conditions of version 3 of the GNU General Public License,
	-supplemented by the additional permissions listed below.
	-
	-## 0. Additional Definitions.
	-
	-As used herein, "this License" refers to version 3 of the GNU Lesser
	-General Public License, and the "GNU GPL" refers to version 3 of the
	-GNU General Public License.
	-
	-"The Library" refers to a covered work governed by this License, other
	-than an Application or a Combined Work as defined below.
	-
	-An "Application" is any work that makes use of an interface provided
	-by the Library, but which is not otherwise based on the Library.
	-Defining a subclass of a class defined by the Library is deemed a mode
	-of using an interface provided by the Library.
	-
	-A "Combined Work" is a work produced by combining or linking an
	-Application with the Library. The particular version of the Library
	-with which the Combined Work was made is also called the "Linked
	-Version".
	-
	-The "Minimal Corresponding Source" for a Combined Work means the
	-Corresponding Source for the Combined Work, excluding any source code
	-for portions of the Combined Work that, considered in isolation, are
	-based on the Application, and not on the Linked Version.
	-
	-The "Corresponding Application Code" for a Combined Work means the
	-object code and/or source code for the Application, including any data
	-and utility programs needed for reproducing the Combined Work from the
	-Application, but excluding the System Libraries of the Combined Work.
	-
	-## 1. Exception to Section 3 of the GNU GPL.
	-
	-You may convey a covered work under sections 3 and 4 of this License
	-without being bound by section 3 of the GNU GPL.
	-
	-## 2. Conveying Modified Versions.
	-
	-If you modify a copy of the Library, and, in your modifications, a
	-facility refers to a function or data to be supplied by an Application
	-that uses the facility (other than as an argument passed when the
	-facility is invoked), then you may convey a copy of the modified
	-version:
	-
	-- a) under this License, provided that you make a good faith effort
	- to ensure that, in the event an Application does not supply the
	- function or data, the facility still operates, and performs
	- whatever part of its purpose remains meaningful, or
	-- b) under the GNU GPL, with none of the additional permissions of
	- this License applicable to that copy.
	-
	-## 3. Object Code Incorporating Material from Library Header Files.
	-
	-The object code form of an Application may incorporate material from a
	-header file that is part of the Library. You may convey such object
	-code under terms of your choice, provided that, if the incorporated
	-material is not limited to numerical parameters, data structure
	-layouts and accessors, or small macros, inline functions and templates
	-(ten or fewer lines in length), you do both of the following:
	-
	-- a) Give prominent notice with each copy of the object code that
	- the Library is used in it and that the Library and its use are
	- covered by this License.
	-- b) Accompany the object code with a copy of the GNU GPL and this
	- license document.
	-
	-## 4. Combined Works.
	-
	-You may convey a Combined Work under terms of your choice that, taken
	-together, effectively do not restrict modification of the portions of
	-the Library contained in the Combined Work and reverse engineering for
	-debugging such modifications, if you also do each of the following:
	-
	-- a) Give prominent notice with each copy of the Combined Work that
	- the Library is used in it and that the Library and its use are
	- covered by this License.
	-- b) Accompany the Combined Work with a copy of the GNU GPL and this
	- license document.
	-- c) For a Combined Work that displays copyright notices during
	- execution, include the copyright notice for the Library among
	- these notices, as well as a reference directing the user to the
	- copies of the GNU GPL and this license document.
	-- d) Do one of the following:
	- - 0) Convey the Minimal Corresponding Source under the terms of
	- this License, and the Corresponding Application Code in a form
	- suitable for, and under terms that permit, the user to
	- recombine or relink the Application with a modified version of
	- the Linked Version to produce a modified Combined Work, in the
	- manner specified by section 6 of the GNU GPL for conveying
	- Corresponding Source.
	- - 1) Use a suitable shared library mechanism for linking with
	- the Library. A suitable mechanism is one that (a) uses at run
	- time a copy of the Library already present on the user's
	- computer system, and (b) will operate properly with a modified
	- version of the Library that is interface-compatible with the
	- Linked Version.
	-- e) Provide Installation Information, but only if you would
	- otherwise be required to provide such information under section 6
	- of the GNU GPL, and only to the extent that such information is
	- necessary to install and execute a modified version of the
	- Combined Work produced by recombining or relinking the Application
	- with a modified version of the Linked Version. (If you use option
	- 4d0, the Installation Information must accompany the Minimal
	- Corresponding Source and Corresponding Application Code. If you
	- use option 4d1, you must provide the Installation Information in
	- the manner specified by section 6 of the GNU GPL for conveying
	- Corresponding Source.)
	-
	-## 5. Combined Libraries.
	-
	-You may place library facilities that are a work based on the Library
	-side by side in a single library together with other library
	-facilities that are not Applications and are not covered by this
	-License, and convey such a combined library under terms of your
	-choice, if you do both of the following:
	-
	-- a) Accompany the combined library with a copy of the same work
	- based on the Library, uncombined with any other library
	- facilities, conveyed under the terms of this License.
	-- b) Give prominent notice with the combined library that part of it
	- is a work based on the Library, and explaining where to find the
	- accompanying uncombined form of the same work.
	-
	-## 6. Revised Versions of the GNU Lesser General Public License.
	-
	-The Free Software Foundation may publish revised and/or new versions
	-of the GNU Lesser General Public License from time to time. Such new
	-versions will be similar in spirit to the present version, but may
	-differ in detail to address new problems or concerns.
	-
	-Each version is given a distinguishing version number. If the Library
	-as you received it specifies that a certain numbered version of the
	-GNU Lesser General Public License "or any later version" applies to
	-it, you have the option of following the terms and conditions either
	-of that published version or of any later version published by the
	-Free Software Foundation. If the Library as you received it does not
	-specify a version number of the GNU Lesser General Public License, you
	-may choose any version of the GNU Lesser General Public License ever
	-published by the Free Software Foundation.
	-
	-If the Library as you received it specifies that a proxy can decide
	-whether future versions of the GNU Lesser General Public License shall
	-apply, that proxy's public statement of acceptance of any version is
	-permanent authorization for you to choose that version for the
	-Library.
	diff --git a/teacher_tutorial_post_buying_plot/gpl-3.0.md b/teacher_tutorial_post_buying_plot/gpl-3.0.md
	deleted file mode 100644
	index 496acdb..0000000
	--- a/teacher_tutorial_post_buying_plot/gpl-3.0.md
	+++ /dev/null
	@@ -1,675 +0,0 @@
	-# GNU GENERAL PUBLIC LICENSE
	-
	-Version 3, 29 June 2007
	-
	-Copyright (C) 2007 Free Software Foundation, Inc.
	-<https://fsf.org/>
	-
	-Everyone is permitted to copy and distribute verbatim copies of this
	-license document, but changing it is not allowed.
	-
	-## Preamble
	-
	-The GNU General Public License is a free, copyleft license for
	-software and other kinds of works.
	-
	-The licenses for most software and other practical works are designed
	-to take away your freedom to share and change the works. By contrast,
	-the GNU General Public License is intended to guarantee your freedom
	-to share and change all versions of a program--to make sure it remains
	-free software for all its users. We, the Free Software Foundation, use
	-the GNU General Public License for most of our software; it applies
	-also to any other work released this way by its authors. You can apply
	-it to your programs, too.
	-
	-When we speak of free software, we are referring to freedom, not
	-price. Our General Public Licenses are designed to make sure that you
	-have the freedom to distribute copies of free software (and charge for
	-them if you wish), that you receive source code or can get it if you
	-want it, that you can change the software or use pieces of it in new
	-free programs, and that you know you can do these things.
	-
	-To protect your rights, we need to prevent others from denying you
	-these rights or asking you to surrender the rights. Therefore, you
	-have certain responsibilities if you distribute copies of the
	-software, or if you modify it: responsibilities to respect the freedom
	-of others.
	-
	-For example, if you distribute copies of such a program, whether
	-gratis or for a fee, you must pass on to the recipients the same
	-freedoms that you received. You must make sure that they, too, receive
	-or can get the source code. And you must show them these terms so they
	-know their rights.
	-
	-Developers that use the GNU GPL protect your rights with two steps:
	-(1) assert copyright on the software, and (2) offer you this License
	-giving you legal permission to copy, distribute and/or modify it.
	-
	-For the developers' and authors' protection, the GPL clearly explains
	-that there is no warranty for this free software. For both users' and
	-authors' sake, the GPL requires that modified versions be marked as
	-changed, so that their problems will not be attributed erroneously to
	-authors of previous versions.
	-
	-Some devices are designed to deny users access to install or run
	-modified versions of the software inside them, although the
	-manufacturer can do so. This is fundamentally incompatible with the
	-aim of protecting users' freedom to change the software. The
	-systematic pattern of such abuse occurs in the area of products for
	-individuals to use, which is precisely where it is most unacceptable.
	-Therefore, we have designed this version of the GPL to prohibit the
	-practice for those products. If such problems arise substantially in
	-other domains, we stand ready to extend this provision to those
	-domains in future versions of the GPL, as needed to protect the
	-freedom of users.
	-
	-Finally, every program is threatened constantly by software patents.
	-States should not allow patents to restrict development and use of
	-software on general-purpose computers, but in those that do, we wish
	-to avoid the special danger that patents applied to a free program
	-could make it effectively proprietary. To prevent this, the GPL
	-assures that patents cannot be used to render the program non-free.
	-
	-The precise terms and conditions for copying, distribution and
	-modification follow.
	-
	-## TERMS AND CONDITIONS
	-
	-### 0. Definitions.
	-
	-"This License" refers to version 3 of the GNU General Public License.
	-
	-"Copyright" also means copyright-like laws that apply to other kinds
	-of works, such as semiconductor masks.
	-
	-"The Program" refers to any copyrightable work licensed under this
	-License. Each licensee is addressed as "you". "Licensees" and
	-"recipients" may be individuals or organizations.
	-
	-To "modify" a work means to copy from or adapt all or part of the work
	-in a fashion requiring copyright permission, other than the making of
	-an exact copy. The resulting work is called a "modified version" of
	-the earlier work or a work "based on" the earlier work.
	-
	-A "covered work" means either the unmodified Program or a work based
	-on the Program.
	-
	-To "propagate" a work means to do anything with it that, without
	-permission, would make you directly or secondarily liable for
	-infringement under applicable copyright law, except executing it on a
	-computer or modifying a private copy. Propagation includes copying,
	-distribution (with or without modification), making available to the
	-public, and in some countries other activities as well.
	-
	-To "convey" a work means any kind of propagation that enables other
	-parties to make or receive copies. Mere interaction with a user
	-through a computer network, with no transfer of a copy, is not
	-conveying.
	-
	-An interactive user interface displays "Appropriate Legal Notices" to
	-the extent that it includes a convenient and prominently visible
	-feature that (1) displays an appropriate copyright notice, and (2)
	-tells the user that there is no warranty for the work (except to the
	-extent that warranties are provided), that licensees may convey the
	-work under this License, and how to view a copy of this License. If
	-the interface presents a list of user commands or options, such as a
	-menu, a prominent item in the list meets this criterion.
	-
	-### 1. Source Code.
	-
	-The "source code" for a work means the preferred form of the work for
	-making modifications to it. "Object code" means any non-source form of
	-a work.
	-
	-A "Standard Interface" means an interface that either is an official
	-standard defined by a recognized standards body, or, in the case of
	-interfaces specified for a particular programming language, one that
	-is widely used among developers working in that language.
	-
	-The "System Libraries" of an executable work include anything, other
	-than the work as a whole, that (a) is included in the normal form of
	-packaging a Major Component, but which is not part of that Major
	-Component, and (b) serves only to enable use of the work with that
	-Major Component, or to implement a Standard Interface for which an
	-implementation is available to the public in source code form. A
	-"Major Component", in this context, means a major essential component
	-(kernel, window system, and so on) of the specific operating system
	-(if any) on which the executable work runs, or a compiler used to
	-produce the work, or an object code interpreter used to run it.
	-
	-The "Corresponding Source" for a work in object code form means all
	-the source code needed to generate, install, and (for an executable
	-work) run the object code and to modify the work, including scripts to
	-control those activities. However, it does not include the work's
	-System Libraries, or general-purpose tools or generally available free
	-programs which are used unmodified in performing those activities but
	-which are not part of the work. For example, Corresponding Source
	-includes interface definition files associated with source files for
	-the work, and the source code for shared libraries and dynamically
	-linked subprograms that the work is specifically designed to require,
	-such as by intimate data communication or control flow between those
	-subprograms and other parts of the work.
	-
	-The Corresponding Source need not include anything that users can
	-regenerate automatically from other parts of the Corresponding Source.
	-
	-The Corresponding Source for a work in source code form is that same
	-work.
	-
	-### 2. Basic Permissions.
	-
	-All rights granted under this License are granted for the term of
	-copyright on the Program, and are irrevocable provided the stated
	-conditions are met. This License explicitly affirms your unlimited
	-permission to run the unmodified Program. The output from running a
	-covered work is covered by this License only if the output, given its
	-content, constitutes a covered work. This License acknowledges your
	-rights of fair use or other equivalent, as provided by copyright law.
	-
	-You may make, run and propagate covered works that you do not convey,
	-without conditions so long as your license otherwise remains in force.
	-You may convey covered works to others for the sole purpose of having
	-them make modifications exclusively for you, or provide you with
	-facilities for running those works, provided that you comply with the
	-terms of this License in conveying all material for which you do not
	-control copyright. Those thus making or running the covered works for
	-you must do so exclusively on your behalf, under your direction and
	-control, on terms that prohibit them from making any copies of your
	-copyrighted material outside their relationship with you.
	-
	-Conveying under any other circumstances is permitted solely under the
	-conditions stated below. Sublicensing is not allowed; section 10 makes
	-it unnecessary.
	-
	-### 3. Protecting Users' Legal Rights From Anti-Circumvention Law.
	-
	-No covered work shall be deemed part of an effective technological
	-measure under any applicable law fulfilling obligations under article
	-11 of the WIPO copyright treaty adopted on 20 December 1996, or
	-similar laws prohibiting or restricting circumvention of such
	-measures.
	-
	-When you convey a covered work, you waive any legal power to forbid
	-circumvention of technological measures to the extent such
	-circumvention is effected by exercising rights under this License with
	-respect to the covered work, and you disclaim any intention to limit
	-operation or modification of the work as a means of enforcing, against
	-the work's users, your or third parties' legal rights to forbid
	-circumvention of technological measures.
	-
	-### 4. Conveying Verbatim Copies.
	-
	-You may convey verbatim copies of the Program's source code as you
	-receive it, in any medium, provided that you conspicuously and
	-appropriately publish on each copy an appropriate copyright notice;
	-keep intact all notices stating that this License and any
	-non-permissive terms added in accord with section 7 apply to the code;
	-keep intact all notices of the absence of any warranty; and give all
	-recipients a copy of this License along with the Program.
	-
	-You may charge any price or no price for each copy that you convey,
	-and you may offer support or warranty protection for a fee.
	-
	-### 5. Conveying Modified Source Versions.
	-
	-You may convey a work based on the Program, or the modifications to
	-produce it from the Program, in the form of source code under the
	-terms of section 4, provided that you also meet all of these
	-conditions:
	-
	-- a) The work must carry prominent notices stating that you modified
	- it, and giving a relevant date.
	-- b) The work must carry prominent notices stating that it is
	- released under this License and any conditions added under
	- section 7. This requirement modifies the requirement in section 4
	- to "keep intact all notices".
	-- c) You must license the entire work, as a whole, under this
	- License to anyone who comes into possession of a copy. This
	- License will therefore apply, along with any applicable section 7
	- additional terms, to the whole of the work, and all its parts,
	- regardless of how they are packaged. This License gives no
	- permission to license the work in any other way, but it does not
	- invalidate such permission if you have separately received it.
	-- d) If the work has interactive user interfaces, each must display
	- Appropriate Legal Notices; however, if the Program has interactive
	- interfaces that do not display Appropriate Legal Notices, your
	- work need not make them do so.
	-
	-A compilation of a covered work with other separate and independent
	-works, which are not by their nature extensions of the covered work,
	-and which are not combined with it such as to form a larger program,
	-in or on a volume of a storage or distribution medium, is called an
	-"aggregate" if the compilation and its resulting copyright are not
	-used to limit the access or legal rights of the compilation's users
	-beyond what the individual works permit. Inclusion of a covered work
	-in an aggregate does not cause this License to apply to the other
	-parts of the aggregate.
	-
	-### 6. Conveying Non-Source Forms.
	-
	-You may convey a covered work in object code form under the terms of
	-sections 4 and 5, provided that you also convey the machine-readable
	-Corresponding Source under the terms of this License, in one of these
	-ways:
	-
	-- a) Convey the object code in, or embodied in, a physical product
	- (including a physical distribution medium), accompanied by the
	- Corresponding Source fixed on a durable physical medium
	- customarily used for software interchange.
	-- b) Convey the object code in, or embodied in, a physical product
	- (including a physical distribution medium), accompanied by a
	- written offer, valid for at least three years and valid for as
	- long as you offer spare parts or customer support for that product
	- model, to give anyone who possesses the object code either (1) a
	- copy of the Corresponding Source for all the software in the
	- product that is covered by this License, on a durable physical
	- medium customarily used for software interchange, for a price no
	- more than your reasonable cost of physically performing this
	- conveying of source, or (2) access to copy the Corresponding
	- Source from a network server at no charge.
	-- c) Convey individual copies of the object code with a copy of the
	- written offer to provide the Corresponding Source. This
	- alternative is allowed only occasionally and noncommercially, and
	- only if you received the object code with such an offer, in accord
	- with subsection 6b.
	-- d) Convey the object code by offering access from a designated
	- place (gratis or for a charge), and offer equivalent access to the
	- Corresponding Source in the same way through the same place at no
	- further charge. You need not require recipients to copy the
	- Corresponding Source along with the object code. If the place to
	- copy the object code is a network server, the Corresponding Source
	- may be on a different server (operated by you or a third party)
	- that supports equivalent copying facilities, provided you maintain
	- clear directions next to the object code saying where to find the
	- Corresponding Source. Regardless of what server hosts the
	- Corresponding Source, you remain obligated to ensure that it is
	- available for as long as needed to satisfy these requirements.
	-- e) Convey the object code using peer-to-peer transmission,
	- provided you inform other peers where the object code and
	- Corresponding Source of the work are being offered to the general
	- public at no charge under subsection 6d.
	-
	-A separable portion of the object code, whose source code is excluded
	-from the Corresponding Source as a System Library, need not be
	-included in conveying the object code work.
	-
	-A "User Product" is either (1) a "consumer product", which means any
	-tangible personal property which is normally used for personal,
	-family, or household purposes, or (2) anything designed or sold for
	-incorporation into a dwelling. In determining whether a product is a
	-consumer product, doubtful cases shall be resolved in favor of
	-coverage. For a particular product received by a particular user,
	-"normally used" refers to a typical or common use of that class of
	-product, regardless of the status of the particular user or of the way
	-in which the particular user actually uses, or expects or is expected
	-to use, the product. A product is a consumer product regardless of
	-whether the product has substantial commercial, industrial or
	-non-consumer uses, unless such uses represent the only significant
	-mode of use of the product.
	-
	-"Installation Information" for a User Product means any methods,
	-procedures, authorization keys, or other information required to
	-install and execute modified versions of a covered work in that User
	-Product from a modified version of its Corresponding Source. The
	-information must suffice to ensure that the continued functioning of
	-the modified object code is in no case prevented or interfered with
	-solely because modification has been made.
	-
	-If you convey an object code work under this section in, or with, or
	-specifically for use in, a User Product, and the conveying occurs as
	-part of a transaction in which the right of possession and use of the
	-User Product is transferred to the recipient in perpetuity or for a
	-fixed term (regardless of how the transaction is characterized), the
	-Corresponding Source conveyed under this section must be accompanied
	-by the Installation Information. But this requirement does not apply
	-if neither you nor any third party retains the ability to install
	-modified object code on the User Product (for example, the work has
	-been installed in ROM).
	-
	-The requirement to provide Installation Information does not include a
	-requirement to continue to provide support service, warranty, or
	-updates for a work that has been modified or installed by the
	-recipient, or for the User Product in which it has been modified or
	-installed. Access to a network may be denied when the modification
	-itself materially and adversely affects the operation of the network
	-or violates the rules and protocols for communication across the
	-network.
	-
	-Corresponding Source conveyed, and Installation Information provided,
	-in accord with this section must be in a format that is publicly
	-documented (and with an implementation available to the public in
	-source code form), and must require no special password or key for
	-unpacking, reading or copying.
	-
	-### 7. Additional Terms.
	-
	-"Additional permissions" are terms that supplement the terms of this
	-License by making exceptions from one or more of its conditions.
	-Additional permissions that are applicable to the entire Program shall
	-be treated as though they were included in this License, to the extent
	-that they are valid under applicable law. If additional permissions
	-apply only to part of the Program, that part may be used separately
	-under those permissions, but the entire Program remains governed by
	-this License without regard to the additional permissions.
	-
	-When you convey a copy of a covered work, you may at your option
	-remove any additional permissions from that copy, or from any part of
	-it. (Additional permissions may be written to require their own
	-removal in certain cases when you modify the work.) You may place
	-additional permissions on material, added by you to a covered work,
	-for which you have or can give appropriate copyright permission.
	-
	-Notwithstanding any other provision of this License, for material you
	-add to a covered work, you may (if authorized by the copyright holders
	-of that material) supplement the terms of this License with terms:
	-
	-- a) Disclaiming warranty or limiting liability differently from the
	- terms of sections 15 and 16 of this License; or
	-- b) Requiring preservation of specified reasonable legal notices or
	- author attributions in that material or in the Appropriate Legal
	- Notices displayed by works containing it; or
	-- c) Prohibiting misrepresentation of the origin of that material,
	- or requiring that modified versions of such material be marked in
	- reasonable ways as different from the original version; or
	-- d) Limiting the use for publicity purposes of names of licensors
	- or authors of the material; or
	-- e) Declining to grant rights under trademark law for use of some
	- trade names, trademarks, or service marks; or
	-- f) Requiring indemnification of licensors and authors of that
	- material by anyone who conveys the material (or modified versions
	- of it) with contractual assumptions of liability to the recipient,
	- for any liability that these contractual assumptions directly
	- impose on those licensors and authors.
	-
	-All other non-permissive additional terms are considered "further
	-restrictions" within the meaning of section 10. If the Program as you
	-received it, or any part of it, contains a notice stating that it is
	-governed by this License along with a term that is a further
	-restriction, you may remove that term. If a license document contains
	-a further restriction but permits relicensing or conveying under this
	-License, you may add to a covered work material governed by the terms
	-of that license document, provided that the further restriction does
	-not survive such relicensing or conveying.
	-
	-If you add terms to a covered work in accord with this section, you
	-must place, in the relevant source files, a statement of the
	-additional terms that apply to those files, or a notice indicating
	-where to find the applicable terms.
	-
	-Additional terms, permissive or non-permissive, may be stated in the
	-form of a separately written license, or stated as exceptions; the
	-above requirements apply either way.
	-
	-### 8. Termination.
	-
	-You may not propagate or modify a covered work except as expressly
	-provided under this License. Any attempt otherwise to propagate or
	-modify it is void, and will automatically terminate your rights under
	-this License (including any patent licenses granted under the third
	-paragraph of section 11).
	-
	-However, if you cease all violation of this License, then your license
	-from a particular copyright holder is reinstated (a) provisionally,
	-unless and until the copyright holder explicitly and finally
	-terminates your license, and (b) permanently, if the copyright holder
	-fails to notify you of the violation by some reasonable means prior to
	-60 days after the cessation.
	-
	-Moreover, your license from a particular copyright holder is
	-reinstated permanently if the copyright holder notifies you of the
	-violation by some reasonable means, this is the first time you have
	-received notice of violation of this License (for any work) from that
	-copyright holder, and you cure the violation prior to 30 days after
	-your receipt of the notice.
	-
	-Termination of your rights under this section does not terminate the
	-licenses of parties who have received copies or rights from you under
	-this License. If your rights have been terminated and not permanently
	-reinstated, you do not qualify to receive new licenses for the same
	-material under section 10.
	-
	-### 9. Acceptance Not Required for Having Copies.
	-
	-You are not required to accept this License in order to receive or run
	-a copy of the Program. Ancillary propagation of a covered work
	-occurring solely as a consequence of using peer-to-peer transmission
	-to receive a copy likewise does not require acceptance. However,
	-nothing other than this License grants you permission to propagate or
	-modify any covered work. These actions infringe copyright if you do
	-not accept this License. Therefore, by modifying or propagating a
	-covered work, you indicate your acceptance of this License to do so.
	-
	-### 10. Automatic Licensing of Downstream Recipients.
	-
	-Each time you convey a covered work, the recipient automatically
	-receives a license from the original licensors, to run, modify and
	-propagate that work, subject to this License. You are not responsible
	-for enforcing compliance by third parties with this License.
	-
	-An "entity transaction" is a transaction transferring control of an
	-organization, or substantially all assets of one, or subdividing an
	-organization, or merging organizations. If propagation of a covered
	-work results from an entity transaction, each party to that
	-transaction who receives a copy of the work also receives whatever
	-licenses to the work the party's predecessor in interest had or could
	-give under the previous paragraph, plus a right to possession of the
	-Corresponding Source of the work from the predecessor in interest, if
	-the predecessor has it or can get it with reasonable efforts.
	-
	-You may not impose any further restrictions on the exercise of the
	-rights granted or affirmed under this License. For example, you may
	-not impose a license fee, royalty, or other charge for exercise of
	-rights granted under this License, and you may not initiate litigation
	-(including a cross-claim or counterclaim in a lawsuit) alleging that
	-any patent claim is infringed by making, using, selling, offering for
	-sale, or importing the Program or any portion of it.
	-
	-### 11. Patents.
	-
	-A "contributor" is a copyright holder who authorizes use under this
	-License of the Program or a work on which the Program is based. The
	-work thus licensed is called the contributor's "contributor version".
	-
	-A contributor's "essential patent claims" are all patent claims owned
	-or controlled by the contributor, whether already acquired or
	-hereafter acquired, that would be infringed by some manner, permitted
	-by this License, of making, using, or selling its contributor version,
	-but do not include claims that would be infringed only as a
	-consequence of further modification of the contributor version. For
	-purposes of this definition, "control" includes the right to grant
	-patent sublicenses in a manner consistent with the requirements of
	-this License.
	-
	-Each contributor grants you a non-exclusive, worldwide, royalty-free
	-patent license under the contributor's essential patent claims, to
	-make, use, sell, offer for sale, import and otherwise run, modify and
	-propagate the contents of its contributor version.
	-
	-In the following three paragraphs, a "patent license" is any express
	-agreement or commitment, however denominated, not to enforce a patent
	-(such as an express permission to practice a patent or covenant not to
	-sue for patent infringement). To "grant" such a patent license to a
	-party means to make such an agreement or commitment not to enforce a
	-patent against the party.
	-
	-If you convey a covered work, knowingly relying on a patent license,
	-and the Corresponding Source of the work is not available for anyone
	-to copy, free of charge and under the terms of this License, through a
	-publicly available network server or other readily accessible means,
	-then you must either (1) cause the Corresponding Source to be so
	-available, or (2) arrange to deprive yourself of the benefit of the
	-patent license for this particular work, or (3) arrange, in a manner
	-consistent with the requirements of this License, to extend the patent
	-license to downstream recipients. "Knowingly relying" means you have
	-actual knowledge that, but for the patent license, your conveying the
	-covered work in a country, or your recipient's use of the covered work
	-in a country, would infringe one or more identifiable patents in that
	-country that you have reason to believe are valid.
	-
	-If, pursuant to or in connection with a single transaction or
	-arrangement, you convey, or propagate by procuring conveyance of, a
	-covered work, and grant a patent license to some of the parties
	-receiving the covered work authorizing them to use, propagate, modify
	-or convey a specific copy of the covered work, then the patent license
	-you grant is automatically extended to all recipients of the covered
	-work and works based on it.
	-
	-A patent license is "discriminatory" if it does not include within the
	-scope of its coverage, prohibits the exercise of, or is conditioned on
	-the non-exercise of one or more of the rights that are specifically
	-granted under this License. You may not convey a covered work if you
	-are a party to an arrangement with a third party that is in the
	-business of distributing software, under which you make payment to the
	-third party based on the extent of your activity of conveying the
	-work, and under which the third party grants, to any of the parties
	-who would receive the covered work from you, a discriminatory patent
	-license (a) in connection with copies of the covered work conveyed by
	-you (or copies made from those copies), or (b) primarily for and in
	-connection with specific products or compilations that contain the
	-covered work, unless you entered into that arrangement, or that patent
	-license was granted, prior to 28 March 2007.
	-
	-Nothing in this License shall be construed as excluding or limiting
	-any implied license or other defenses to infringement that may
	-otherwise be available to you under applicable patent law.
	-
	-### 12. No Surrender of Others' Freedom.
	-
	-If conditions are imposed on you (whether by court order, agreement or
	-otherwise) that contradict the conditions of this License, they do not
	-excuse you from the conditions of this License. If you cannot convey a
	-covered work so as to satisfy simultaneously your obligations under
	-this License and any other pertinent obligations, then as a
	-consequence you may not convey it at all. For example, if you agree to
	-terms that obligate you to collect a royalty for further conveying
	-from those to whom you convey the Program, the only way you could
	-satisfy both those terms and this License would be to refrain entirely
	-from conveying the Program.
	-
	-### 13. Use with the GNU Affero General Public License.
	-
	-Notwithstanding any other provision of this License, you have
	-permission to link or combine any covered work with a work licensed
	-under version 3 of the GNU Affero General Public License into a single
	-combined work, and to convey the resulting work. The terms of this
	-License will continue to apply to the part which is the covered work,
	-but the special requirements of the GNU Affero General Public License,
	-section 13, concerning interaction through a network will apply to the
	-combination as such.
	-
	-### 14. Revised Versions of this License.
	-
	-The Free Software Foundation may publish revised and/or new versions
	-of the GNU General Public License from time to time. Such new versions
	-will be similar in spirit to the present version, but may differ in
	-detail to address new problems or concerns.
	-
	-Each version is given a distinguishing version number. If the Program
	-specifies that a certain numbered version of the GNU General Public
	-License "or any later version" applies to it, you have the option of
	-following the terms and conditions either of that numbered version or
	-of any later version published by the Free Software Foundation. If the
	-Program does not specify a version number of the GNU General Public
	-License, you may choose any version ever published by the Free
	-Software Foundation.
	-
	-If the Program specifies that a proxy can decide which future versions
	-of the GNU General Public License can be used, that proxy's public
	-statement of acceptance of a version permanently authorizes you to
	-choose that version for the Program.
	-
	-Later license versions may give you additional or different
	-permissions. However, no additional obligations are imposed on any
	-author or copyright holder as a result of your choosing to follow a
	-later version.
	-
	-### 15. Disclaimer of Warranty.
	-
	-THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
	-APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
	-HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT
	-WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT
	-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	-A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND
	-PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE
	-DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR
	-CORRECTION.
	-
	-### 16. Limitation of Liability.
	-
	-IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
	-WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR
	-CONVEYS THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
	-INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES
	-ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT
	-NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR
	-LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM
	-TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER
	-PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
	-
	-### 17. Interpretation of Sections 15 and 16.
	-
	-If the disclaimer of warranty and limitation of liability provided
	-above cannot be given local legal effect according to their terms,
	-reviewing courts shall apply local law that most closely approximates
	-an absolute waiver of all civil liability in connection with the
	-Program, unless a warranty or assumption of liability accompanies a
	-copy of the Program in return for a fee.
	-
	-END OF TERMS AND CONDITIONS
	-
	-## How to Apply These Terms to Your New Programs
	-
	-If you develop a new program, and you want it to be of the greatest
	-possible use to the public, the best way to achieve this is to make it
	-free software which everyone can redistribute and change under these
	-terms.
	-
	-To do so, attach the following notices to the program. It is safest to
	-attach them to the start of each source file to most effectively state
	-the exclusion of warranty; and each file should have at least the
	-"copyright" line and a pointer to where the full notice is found.
	-
	- <one line to give the program's name and a brief idea of what it does.>
	- Copyright (C) <year> <name of author>
	-
	- This program is free software: you can redistribute it and/or modify
	- it under the terms of the GNU General Public License as published by
	- the Free Software Foundation, either version 3 of the License, or
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	diff --git a/teacher_tutorial_post_buying_plot/lgpl-3.0.md b/teacher_tutorial_post_buying_plot/lgpl-3.0.md
	deleted file mode 100644
	index 6fb6a01..0000000
	--- a/teacher_tutorial_post_buying_plot/lgpl-3.0.md
	+++ /dev/null
	@@ -1,157 +0,0 @@
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	diff --git a/technic_mod/lgpl-2.1.txt b/technic_mod/lgpl-2.1.txt
	deleted file mode 100644
	index e5ab03e..0000000
	--- a/technic_mod/lgpl-2.1.txt
	+++ /dev/null
	@@ -1,502 +0,0 @@
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	- <one line to give the library's name and a brief idea of what it does.>
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	- This library is distributed in the hope that it will be useful,
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	-Also add information on how to contact you by electronic and paper mail.
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	-You should also get your employer (if you work as a programmer) or your
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	-
	- Yoyodyne, Inc., hereby disclaims all copyright interest in the
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	- <signature of Ty Coon>, 1 April 1990
	- Ty Coon, President of Vice
	-
	-That's all there is to it!
	diff --git a/twi_bgm/gpl-3.0.md b/twi_bgm/gpl-3.0.md
	deleted file mode 100644
	index 496acdb..0000000
	--- a/twi_bgm/gpl-3.0.md
	+++ /dev/null
	@@ -1,675 +0,0 @@
	-# GNU GENERAL PUBLIC LICENSE
	-
	-Version 3, 29 June 2007
	-
	-Copyright (C) 2007 Free Software Foundation, Inc.
	-<https://fsf.org/>
	-
	-Everyone is permitted to copy and distribute verbatim copies of this
	-license document, but changing it is not allowed.
	-
	-## Preamble
	-
	-The GNU General Public License is a free, copyleft license for
	-software and other kinds of works.
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	-The licenses for most software and other practical works are designed
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	-When we speak of free software, we are referring to freedom, not
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	-To protect your rights, we need to prevent others from denying you
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	-The precise terms and conditions for copying, distribution and
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	-
	-## TERMS AND CONDITIONS
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	-### 0. Definitions.
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	-"This License" refers to version 3 of the GNU General Public License.
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	-### 7. Additional Terms.
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	-### 8. Termination.
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	-### 9. Acceptance Not Required for Having Copies.
	-
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	-modify any covered work. These actions infringe copyright if you do
	-not accept this License. Therefore, by modifying or propagating a
	-covered work, you indicate your acceptance of this License to do so.
	-
	-### 10. Automatic Licensing of Downstream Recipients.
	-
	-Each time you convey a covered work, the recipient automatically
	-receives a license from the original licensors, to run, modify and
	-propagate that work, subject to this License. You are not responsible
	-for enforcing compliance by third parties with this License.
	-
	-An "entity transaction" is a transaction transferring control of an
	-organization, or substantially all assets of one, or subdividing an
	-organization, or merging organizations. If propagation of a covered
	-work results from an entity transaction, each party to that
	-transaction who receives a copy of the work also receives whatever
	-licenses to the work the party's predecessor in interest had or could
	-give under the previous paragraph, plus a right to possession of the
	-Corresponding Source of the work from the predecessor in interest, if
	-the predecessor has it or can get it with reasonable efforts.
	-
	-You may not impose any further restrictions on the exercise of the
	-rights granted or affirmed under this License. For example, you may
	-not impose a license fee, royalty, or other charge for exercise of
	-rights granted under this License, and you may not initiate litigation
	-(including a cross-claim or counterclaim in a lawsuit) alleging that
	-any patent claim is infringed by making, using, selling, offering for
	-sale, or importing the Program or any portion of it.
	-
	-### 11. Patents.
	-
	-A "contributor" is a copyright holder who authorizes use under this
	-License of the Program or a work on which the Program is based. The
	-work thus licensed is called the contributor's "contributor version".
	-
	-A contributor's "essential patent claims" are all patent claims owned
	-or controlled by the contributor, whether already acquired or
	-hereafter acquired, that would be infringed by some manner, permitted
	-by this License, of making, using, or selling its contributor version,
	-but do not include claims that would be infringed only as a
	-consequence of further modification of the contributor version. For
	-purposes of this definition, "control" includes the right to grant
	-patent sublicenses in a manner consistent with the requirements of
	-this License.
	-
	-Each contributor grants you a non-exclusive, worldwide, royalty-free
	-patent license under the contributor's essential patent claims, to
	-make, use, sell, offer for sale, import and otherwise run, modify and
	-propagate the contents of its contributor version.
	-
	-In the following three paragraphs, a "patent license" is any express
	-agreement or commitment, however denominated, not to enforce a patent
	-(such as an express permission to practice a patent or covenant not to
	-sue for patent infringement). To "grant" such a patent license to a
	-party means to make such an agreement or commitment not to enforce a
	-patent against the party.
	-
	-If you convey a covered work, knowingly relying on a patent license,
	-and the Corresponding Source of the work is not available for anyone
	-to copy, free of charge and under the terms of this License, through a
	-publicly available network server or other readily accessible means,
	-then you must either (1) cause the Corresponding Source to be so
	-available, or (2) arrange to deprive yourself of the benefit of the
	-patent license for this particular work, or (3) arrange, in a manner
	-consistent with the requirements of this License, to extend the patent
	-license to downstream recipients. "Knowingly relying" means you have
	-actual knowledge that, but for the patent license, your conveying the
	-covered work in a country, or your recipient's use of the covered work
	-in a country, would infringe one or more identifiable patents in that
	-country that you have reason to believe are valid.
	-
	-If, pursuant to or in connection with a single transaction or
	-arrangement, you convey, or propagate by procuring conveyance of, a
	-covered work, and grant a patent license to some of the parties
	-receiving the covered work authorizing them to use, propagate, modify
	-or convey a specific copy of the covered work, then the patent license
	-you grant is automatically extended to all recipients of the covered
	-work and works based on it.
	-
	-A patent license is "discriminatory" if it does not include within the
	-scope of its coverage, prohibits the exercise of, or is conditioned on
	-the non-exercise of one or more of the rights that are specifically
	-granted under this License. You may not convey a covered work if you
	-are a party to an arrangement with a third party that is in the
	-business of distributing software, under which you make payment to the
	-third party based on the extent of your activity of conveying the
	-work, and under which the third party grants, to any of the parties
	-who would receive the covered work from you, a discriminatory patent
	-license (a) in connection with copies of the covered work conveyed by
	-you (or copies made from those copies), or (b) primarily for and in
	-connection with specific products or compilations that contain the
	-covered work, unless you entered into that arrangement, or that patent
	-license was granted, prior to 28 March 2007.
	-
	-Nothing in this License shall be construed as excluding or limiting
	-any implied license or other defenses to infringement that may
	-otherwise be available to you under applicable patent law.
	-
	-### 12. No Surrender of Others' Freedom.
	-
	-If conditions are imposed on you (whether by court order, agreement or
	-otherwise) that contradict the conditions of this License, they do not
	-excuse you from the conditions of this License. If you cannot convey a
	-covered work so as to satisfy simultaneously your obligations under
	-this License and any other pertinent obligations, then as a
	-consequence you may not convey it at all. For example, if you agree to
	-terms that obligate you to collect a royalty for further conveying
	-from those to whom you convey the Program, the only way you could
	-satisfy both those terms and this License would be to refrain entirely
	-from conveying the Program.
	-
	-### 13. Use with the GNU Affero General Public License.
	-
	-Notwithstanding any other provision of this License, you have
	-permission to link or combine any covered work with a work licensed
	-under version 3 of the GNU Affero General Public License into a single
	-combined work, and to convey the resulting work. The terms of this
	-License will continue to apply to the part which is the covered work,
	-but the special requirements of the GNU Affero General Public License,
	-section 13, concerning interaction through a network will apply to the
	-combination as such.
	-
	-### 14. Revised Versions of this License.
	-
	-The Free Software Foundation may publish revised and/or new versions
	-of the GNU General Public License from time to time. Such new versions
	-will be similar in spirit to the present version, but may differ in
	-detail to address new problems or concerns.
	-
	-Each version is given a distinguishing version number. If the Program
	-specifies that a certain numbered version of the GNU General Public
	-License "or any later version" applies to it, you have the option of
	-following the terms and conditions either of that numbered version or
	-of any later version published by the Free Software Foundation. If the
	-Program does not specify a version number of the GNU General Public
	-License, you may choose any version ever published by the Free
	-Software Foundation.
	-
	-If the Program specifies that a proxy can decide which future versions
	-of the GNU General Public License can be used, that proxy's public
	-statement of acceptance of a version permanently authorizes you to
	-choose that version for the Program.
	-
	-Later license versions may give you additional or different
	-permissions. However, no additional obligations are imposed on any
	-author or copyright holder as a result of your choosing to follow a
	-later version.
	-
	-### 15. Disclaimer of Warranty.
	-
	-THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
	-APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
	-HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT
	-WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT
	-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	-A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND
	-PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE
	-DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR
	-CORRECTION.
	-
	-### 16. Limitation of Liability.
	-
	-IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
	-WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR
	-CONVEYS THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
	-INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES
	-ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT
	-NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR
	-LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM
	-TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER
	-PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
	-
	-### 17. Interpretation of Sections 15 and 16.
	-
	-If the disclaimer of warranty and limitation of liability provided
	-above cannot be given local legal effect according to their terms,
	-reviewing courts shall apply local law that most closely approximates
	-an absolute waiver of all civil liability in connection with the
	-Program, unless a warranty or assumption of liability accompanies a
	-copy of the Program in return for a fee.
	-
	-END OF TERMS AND CONDITIONS
	-
	-## How to Apply These Terms to Your New Programs
	-
	-If you develop a new program, and you want it to be of the greatest
	-possible use to the public, the best way to achieve this is to make it
	-free software which everyone can redistribute and change under these
	-terms.
	-
	-To do so, attach the following notices to the program. It is safest to
	-attach them to the start of each source file to most effectively state
	-the exclusion of warranty; and each file should have at least the
	-"copyright" line and a pointer to where the full notice is found.
	-
	- <one line to give the program's name and a brief idea of what it does.>
	- Copyright (C) <year> <name of author>
	-
	- This program is free software: you can redistribute it and/or modify
	- it under the terms of the GNU General Public License as published by
	- the Free Software Foundation, either version 3 of the License, or
	- (at your option) any later version.
	-
	- This program is distributed in the hope that it will be useful,
	- but WITHOUT ANY WARRANTY; without even the implied warranty of
	- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	- GNU General Public License for more details.
	-
	- You should have received a copy of the GNU General Public License
	- along with this program. If not, see <https://www.gnu.org/licenses/>.
	-
	-Also add information on how to contact you by electronic and paper
	-mail.
	-
	-If the program does terminal interaction, make it output a short
	-notice like this when it starts in an interactive mode:
	-
	- <program> Copyright (C) <year> <name of author>
	- This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
	- This is free software, and you are welcome to redistribute it
	- under certain conditions; type `show c' for details.
	-
	-The hypothetical commands \`show w' and \`show c' should show the
	-appropriate parts of the General Public License. Of course, your
	-program's commands might be different; for a GUI interface, you would
	-use an "about box".
	-
	-You should also get your employer (if you work as a programmer) or
	-school, if any, to sign a "copyright disclaimer" for the program, if
	-necessary. For more information on this, and how to apply and follow
	-the GNU GPL, see <https://www.gnu.org/licenses/>.
	-
	-The GNU General Public License does not permit incorporating your
	-program into proprietary programs. If your program is a subroutine
	-library, you may consider it more useful to permit linking proprietary
	-applications with the library. If this is what you want to do, use the
	-GNU Lesser General Public License instead of this License. But first,
	-please read <https://www.gnu.org/licenses/why-not-lgpl.html>.
	diff --git a/twi_bgm/lgpl-3.0.md b/twi_bgm/lgpl-3.0.md
	deleted file mode 100644
	index 6fb6a01..0000000
	--- a/twi_bgm/lgpl-3.0.md
	+++ /dev/null
	@@ -1,157 +0,0 @@
	-# GNU LESSER GENERAL PUBLIC LICENSE
	-
	-Version 3, 29 June 2007
	-
	-Copyright (C) 2007 Free Software Foundation, Inc.
	-<https://fsf.org/>
	-
	-Everyone is permitted to copy and distribute verbatim copies of this
	-license document, but changing it is not allowed.
	-
	-This version of the GNU Lesser General Public License incorporates the
	-terms and conditions of version 3 of the GNU General Public License,
	-supplemented by the additional permissions listed below.
	-
	-## 0. Additional Definitions.
	-
	-As used herein, "this License" refers to version 3 of the GNU Lesser
	-General Public License, and the "GNU GPL" refers to version 3 of the
	-GNU General Public License.
	-
	-"The Library" refers to a covered work governed by this License, other
	-than an Application or a Combined Work as defined below.
	-
	-An "Application" is any work that makes use of an interface provided
	-by the Library, but which is not otherwise based on the Library.
	-Defining a subclass of a class defined by the Library is deemed a mode
	-of using an interface provided by the Library.
	-
	-A "Combined Work" is a work produced by combining or linking an
	-Application with the Library. The particular version of the Library
	-with which the Combined Work was made is also called the "Linked
	-Version".
	-
	-The "Minimal Corresponding Source" for a Combined Work means the
	-Corresponding Source for the Combined Work, excluding any source code
	-for portions of the Combined Work that, considered in isolation, are
	-based on the Application, and not on the Linked Version.
	-
	-The "Corresponding Application Code" for a Combined Work means the
	-object code and/or source code for the Application, including any data
	-and utility programs needed for reproducing the Combined Work from the
	-Application, but excluding the System Libraries of the Combined Work.
	-
	-## 1. Exception to Section 3 of the GNU GPL.
	-
	-You may convey a covered work under sections 3 and 4 of this License
	-without being bound by section 3 of the GNU GPL.
	-
	-## 2. Conveying Modified Versions.
	-
	-If you modify a copy of the Library, and, in your modifications, a
	-facility refers to a function or data to be supplied by an Application
	-that uses the facility (other than as an argument passed when the
	-facility is invoked), then you may convey a copy of the modified
	-version:
	-
	-- a) under this License, provided that you make a good faith effort
	- to ensure that, in the event an Application does not supply the
	- function or data, the facility still operates, and performs
	- whatever part of its purpose remains meaningful, or
	-- b) under the GNU GPL, with none of the additional permissions of
	- this License applicable to that copy.
	-
	-## 3. Object Code Incorporating Material from Library Header Files.
	-
	-The object code form of an Application may incorporate material from a
	-header file that is part of the Library. You may convey such object
	-code under terms of your choice, provided that, if the incorporated
	-material is not limited to numerical parameters, data structure
	-layouts and accessors, or small macros, inline functions and templates
	-(ten or fewer lines in length), you do both of the following:
	-
	-- a) Give prominent notice with each copy of the object code that
	- the Library is used in it and that the Library and its use are
	- covered by this License.
	-- b) Accompany the object code with a copy of the GNU GPL and this
	- license document.
	-
	-## 4. Combined Works.
	-
	-You may convey a Combined Work under terms of your choice that, taken
	-together, effectively do not restrict modification of the portions of
	-the Library contained in the Combined Work and reverse engineering for
	-debugging such modifications, if you also do each of the following:
	-
	-- a) Give prominent notice with each copy of the Combined Work that
	- the Library is used in it and that the Library and its use are
	- covered by this License.
	-- b) Accompany the Combined Work with a copy of the GNU GPL and this
	- license document.
	-- c) For a Combined Work that displays copyright notices during
	- execution, include the copyright notice for the Library among
	- these notices, as well as a reference directing the user to the
	- copies of the GNU GPL and this license document.
	-- d) Do one of the following:
	- - 0) Convey the Minimal Corresponding Source under the terms of
	- this License, and the Corresponding Application Code in a form
	- suitable for, and under terms that permit, the user to
	- recombine or relink the Application with a modified version of
	- the Linked Version to produce a modified Combined Work, in the
	- manner specified by section 6 of the GNU GPL for conveying
	- Corresponding Source.
	- - 1) Use a suitable shared library mechanism for linking with
	- the Library. A suitable mechanism is one that (a) uses at run
	- time a copy of the Library already present on the user's
	- computer system, and (b) will operate properly with a modified
	- version of the Library that is interface-compatible with the
	- Linked Version.
	-- e) Provide Installation Information, but only if you would
	- otherwise be required to provide such information under section 6
	- of the GNU GPL, and only to the extent that such information is
	- necessary to install and execute a modified version of the
	- Combined Work produced by recombining or relinking the Application
	- with a modified version of the Linked Version. (If you use option
	- 4d0, the Installation Information must accompany the Minimal
	- Corresponding Source and Corresponding Application Code. If you
	- use option 4d1, you must provide the Installation Information in
	- the manner specified by section 6 of the GNU GPL for conveying
	- Corresponding Source.)
	-
	-## 5. Combined Libraries.
	-
	-You may place library facilities that are a work based on the Library
	-side by side in a single library together with other library
	-facilities that are not Applications and are not covered by this
	-License, and convey such a combined library under terms of your
	-choice, if you do both of the following:
	-
	-- a) Accompany the combined library with a copy of the same work
	- based on the Library, uncombined with any other library
	- facilities, conveyed under the terms of this License.
	-- b) Give prominent notice with the combined library that part of it
	- is a work based on the Library, and explaining where to find the
	- accompanying uncombined form of the same work.
	-
	-## 6. Revised Versions of the GNU Lesser General Public License.
	-
	-The Free Software Foundation may publish revised and/or new versions
	-of the GNU Lesser General Public License from time to time. Such new
	-versions will be similar in spirit to the present version, but may
	-differ in detail to address new problems or concerns.
	-
	-Each version is given a distinguishing version number. If the Library
	-as you received it specifies that a certain numbered version of the
	-GNU Lesser General Public License "or any later version" applies to
	-it, you have the option of following the terms and conditions either
	-of that published version or of any later version published by the
	-Free Software Foundation. If the Library as you received it does not
	-specify a version number of the GNU Lesser General Public License, you
	-may choose any version of the GNU Lesser General Public License ever
	-published by the Free Software Foundation.
	-
	-If the Library as you received it specifies that a proxy can decide
	-whether future versions of the GNU Lesser General Public License shall
	-apply, that proxy's public statement of acceptance of any version is
	-permanent authorization for you to choose that version for the
	-Library.

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