Added license files and information.

3rdparty/README.md

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+This directory contains libraries that are not maintained by the CAT-Surface
+maintainers. These libraries are necessary to compile CAT_Surface and are 
+provided here as courtesy to the end-users.
+
+The following library was largely modified:
+- [bicp-1.4.6](https://github.com/BIC-MNI/minc)
+
+All dependencies in bicpl on minc and volume_io were removed and replaced by 
+nifti-functions. The following functions from minc were added:
+- ParseArgv.c
+- alloc.c
+- alloc_check.c
+- progress.c
+- arrays.c

3rdparty/bicpl-surface/LICENSE

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+Copyright the MINC developers, McConnell Brain Imaging Centre, 
+Montreal Neurological Institute, McGill University.
+
+Permission to use, copy, modify, and distribute this software and its
+documentation for any purpose and without fee is hereby granted,
+provided that the above copyright notice appear in all copies.  The
+author and McGill University make no representations about the
+suitability of this software for any purpose.  It is provided "as is"
+without express or implied warranty.

3rdparty/nifti/LICENSE

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+Niftilib has been developed by members of the NIFTI DFWG and volunteers in the
+neuroimaging community and serves as a reference implementation of the nifti-1
+file format.
+
+http://nifti.nimh.nih.gov/
+
+Nifticlib code is released into the public domain, developers are encouraged to
+incorporate niftilib code into their applications, and, to contribute changes
+and enhancements to niftilib.