remove unused links.rst file

doc/links.rst

-.. vim: set fileencoding=utf-8 :
-.. Andre Anjos <andre.anjos@idiap.ch>
-.. Tue 20 Mar 2012 08:57:32 CET 
-
-.. Place here references to all citations in lower case
-
-.. _boost: http://www.boost.org
-.. _buildout: http://pypi.python.org/pypi/zc.buildout/
-.. _c++: http://www2.research.att.com/~bs/C++.html
-.. _numpy: http://numpy.scipy.org
-.. _nose: http://nose.readthedocs.org
-.. _pypi: http://pypi.python.org
-.. _scipy: http://www.scipy.org
-.. _setuptools: http://trac.edgewall.org/wiki/setuptools
-.. _sphinx: http://sphinx.pocoo.org
-
-.. Place here references to licenses
-
-.. _apache-2.0: http://www.opensource.org/licenses/Apache-2.0
-.. _artistic-2.0: http://www.opensource.org/licenses/Artistic-2.0
-.. _bsd-2-clause: http://www.opensource.org/licenses/BSD-2-Clause
-.. _bsd-3-clause: http://www.opensource.org/licenses/BSD-3-Clause
-.. _bsl-1.0: http://www.opensource.org/licenses/BSL-1.0
-.. _gpl-2.0: http://www.opensource.org/licenses/GPL-2.0
-.. _gpl-3.0: http://www.opensource.org/licenses/GPL-3.0
-.. _hdf5 license: ftp://ftp.hdfgroup.org/HDF5/current/src/unpacked/COPYING
-.. _lgpl-2.1: http://www.opensource.org/licenses/LGPL-2.1
-.. _libpng license: http://www.libpng.org/pub/png/src/libpng-LICENSE.txt
-.. _mit: http://www.opensource.org/licenses/MIT
-.. _python-2.0: http://www.opensource.org/licenses/Python-2.0