Add licenses, too

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+PCRE LICENCE
+------------
+
+PCRE is a library of functions to support regular expressions whose syntax
+and semantics are as close as possible to those of the Perl 5 language.
+
+Written by: Philip Hazel <ph10@cam.ac.uk>
+
+University of Cambridge Computing Service,
+Cambridge, England. Phone: +44 1223 334714.
+
+Copyright (c) 1997-2001 University of Cambridge
+
+Permission is granted to anyone to use this software for any purpose on any
+computer system, and to redistribute it freely, subject to the following
+restrictions:
+
+1. This software 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.
+
+2. The origin of this software must not be misrepresented, either by
+   explicit claim or by omission. In practice, this means that if you use
+   PCRE in software that you distribute to others, commercially or
+   otherwise, you must put a sentence like this
+
+     Regular expression support is provided by the PCRE library package,
+     which is open source software, written by Philip Hazel, and copyright
+     by the University of Cambridge, England.
+
+   somewhere reasonably visible in your documentation and in any relevant
+   files or online help data or similar. A reference to the ftp site for
+   the source, that is, to
+
+     ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/
+
+   should also be given in the documentation. However, this condition is not
+   intended to apply to whole chains of software. If package A includes PCRE,
+   it must acknowledge it, but if package B is software that includes package
+   A, the condition is not imposed on package B (unless it uses PCRE
+   independently).
+
+3. Altered versions must be plainly marked as such, and must not be
+   misrepresented as being the original software.
+
+4. If PCRE is embedded in any software that is released under the GNU
+   General Purpose Licence (GPL), or Lesser General Purpose Licence (LGPL),
+   then the terms of that licence shall supersede any condition above with
+   which it is incompatible.
+
+The documentation for PCRE, supplied in the "doc" directory, is distributed
+under the same terms as the software itself.
+
+End