Creating the GRASS GIS 7.0 release branch (development started in 04/2008, https://trac.osgeo.org/grass/changeset/31142)

git-svn-id: https://svn.osgeo.org/grass/grass/branches/releasebranch_7_0@59487 15284696-431f-4ddb-bdfa-cd5b030d7da7