Add lppl-1.0 license.

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+The LATEX Project Public License (lppl)
+
+LPPL Version 1.0 1999-03-01
+
+Copyright 1999 LATEX3 Project
+
+Everyone is permitted to copy and distribute verbatim copies of this
+license document, but modification is not allowed.
+
+PREAMBLE
+
+The LATEX Project Public License (LPPL) is the license under which the
+base LATEX distribution is distributed. As described below you may use
+this licence for any software that you wish to distribute.
+
+It may be particularly suitable if your software is TEX related (such
+as a LATEX package file) but it may be used for any software, even if
+it is unrelated to TEX.
+
+To use this license, the files of your distribution should have an
+explicit copyright notice giving your name and the year, together with
+a reference to this license.
+
+A typical example would be
+
+   %% pig.sty
+   %% Copyright 2001 M. Y. Name
+
+   % This program can redistributed and/or modified under the terms
+   % of the LaTeX Project Public License Distributed from CTAN
+   % archives in directory macros/latex/base/lppl.txt; either
+   % version 1 of the License, or (at your option) any later version.
+
+Given such a notice in the file, the conditions of this document would
+apply, with:
+ * “The Program” referring to the software “pig.sty” and
+ * “The Copyright Holder” referring to the person “M. Y. Name”.
+
+To see a real example, see the file legal.txt which carries the
+copyright notice for the base latex distribution.
+
+This license gives terms under which files of The Program may be
+distributed and modified. Individual files may have specific further
+constraints on modification, but no file should have restrictions on
+distribution other than those specified below. This is to ensure that
+a distributor wishing to distribute a complete unmodified copy of The
+Program need only check the conditions in this file, and does not need
+to check every file in The Program for extra restrictions. If you do
+need to modify the distribution terms of some files, do not refer to
+this license, instead distribute The Program under a different
+license. You may use the parts of the text of LPPL as a model for your
+own license, but your license should not directly refer to the LPPL or
+otherwise give the impression that The Program is distributed under
+the LPPL.
+
+WARRANTY
+
+There is no warranty for The Program, to the extent permitted by
+applicable law. Except when otherwise stated in writing, The Copyright
+Holder provides 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.
+
+In no event unless required by applicable law or agreed to in writing
+will The Copyright Holder, or any of the individual authors named in
+the source for The Program, be liable to you for damages, including
+any general, special, incidental or consequential damages arising out
+of any use of The Program or out of inability to use The Program
+(including but not limited to loss of data or data being rendered
+inaccurate or losses sustained by you or by third parties as a result
+of 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.
+
+DISTRIBUTION
+
+Redistribution of unchanged files is allowed provided that all files
+that make up the distribution of The Program are distributed. In
+particular this means that The Program has to be distributed including
+its documentation if documentation was part of the original
+distribution.
+
+The distribution of The Program will contain a prominent file listing
+all the files covered by this license.
+
+If you receive only some of these files from someone, complain!
+
+The distribution of changed versions of certain files included in the
+The Program, and the reuse of code from The Program, are allowed under
+the following restrictions:
+
+It is allowed only if the legal notice in the file does not expressly
+forbid it. See note below, under “Conditions on individual
+files&lrquo;.
+
+You rename the file before you make any changes to it, unless the file
+explicitly says that renaming is not required. Any such changed files
+must be distributed under a license that forbids distribution of those
+files, and any files derived from them, under the names used by the
+original files in the distribution of The Program.
+
+You change any “identification string” in The Program to clearly
+indicate that the file is not part of the standard system.
+
+If The Program includes an “error report address” so that errors may
+be reported to The Copyright Holder, or other specified addresses,
+this address must be changed in any modified versions of The Program,
+so that reports for files not maintained by the original program
+maintainers are directed to the maintainers of the changed files.
+
+You acknowledge the source and authorship of the original version in
+the modified file.
+
+You also distribute the unmodified version of the file or
+alternatively provide sufficient information so that the user of your
+modified file can be reasonably expected to be able to obtain an
+original, unmodified copy of The Program. For example, you may specify
+a URL to a site that you expect will freely provide the user with a
+copy of The Program (either the version on which your modification is
+based, or perhaps a later version).
+
+If The Program is intended to be used with, or is based on, LATEX,
+then files with the following file extensions which have special
+meaning in LATEX Software, have special modification rules under the
+license:
+
+Files with extension “.ins” (installation files): these files may not
+be modified at all because they contain the legal notices that are
+placed in the generated files.
+
+Files with extension “.fd” (LATEX font definitions files): these files
+are allowed to be modified without changing the name, but only to
+enable use of all available fonts and to prevent attempts to access
+unavailable fonts. However, modified files are not allowed to be
+distributed in place of original files.
+
+Files with extension “.cfg” (configuration files): these files can be
+created or modified to enable easy configuration of the system. The
+documentation in cfg­guide.tex in the base LATEX distribution
+describes when it makes sense to modify or generate such files.
+
+The above restrictions are not intended to prohibit, and hence do not
+apply to, the updating, by any method, of a file so that it becomes
+identical to the latest version of that file in The Program.
+
+NOTES
+
+We believe that these requirements give you the freedom you to make
+modifications that conform with whatever technical specifications you
+wish, whilst maintaining the availability, integrity and reliability
+of The Program. If you do not see how to achieve your goal whilst
+adhering to these requirements then read the document cfg­guide.tex in
+the base LATEX distribution for suggestions.
+
+Because of the portability and exchangeability aspects of systems like
+LATEX, The LATEX3 Project deprecates the distribution of nonstandard
+versions of components of LATEX or of generally available contributed
+code for them but such distributions are permitted under the above
+restrictions.
+
+The document mod­guide.tex in the base LATEX distribution details the
+reasons for the legal requirements detailed above. Even if The Program
+is unrelated to LATEX, the argument in mod­guide.tex may still apply,
+and should be read before a modified version of The Program is
+distributed.
+
+Conditions on individual files
+
+The individual files may bear additional conditions which supersede
+the general conditions on distribution and modification contained in
+this file. If there are any such files, the distribution of The
+Program will contain a prominent file that lists all the exceptional
+files.
+
+Typical examples of files with more restrictive modification
+conditions would be files that contain the text of copyright notices.
+
+The conditions on individual files differ only in the extent of
+modification that is allowed.
+
+The conditions on distribution are the same for all the files. Thus a
+(re)distributor of a complete, unchanged copy of The Program need meet
+only the conditions in this file; it is not necessary to check the
+header of every file in the distribution to check that a distribution
+meets these requirements.
+