/LICENSE.TXT: added note that when redistributing, it recommended to include _license/, so that the open-source proof is included along with the license text (this information should be here as well as in _license/README.TXT because redistributors might not think to look in that file)
/LICENSE.TXT: removed "svn" before "repository" because this would apply equally to a git export of the repository
/LICENSE.TXT: replaced "portions" with "parts" for consistency with the _license/README.TXT wording
/LICENSE.TXT: added collective license conditions (GPL2+) for the svn repository as a whole, except the non-open-source portions
added LICENSE.TXT and related files (in _license/). the open-source portions of the svn repository are licensed as described in _license/. note that some portions of the svn repository are NOT open-source. these are copyright their respective owners.