updated the LICENSE files
Merge pull request #115 from komatits/devel

updated the LICENSE files
with the agreement of the GeoCUBIT authors, changed the GeoCUBIT license from GNU GPL v3 to v2+ to avoid potential incompatibility issues with SPECFEM3D
Merge pull request #116 from komatits/devel

with the agreement of the GeoCUBIT authors, changed the GeoCUBIT license...
Update README
replaced all the GeoCUBIT GNU GPL v3 license headers with v2+
Merge pull request #117 from komatits/devel

replaced all the GeoCUBIT GNU GPL v3 license headers with v2+; also removed CTRL-M from end of lines in one of the Python files