Revision control
++ 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.
++
++ GNU GENERAL PUBLIC LICENSE
++ 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 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 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 instead of this License.