build_core: during cleanup if the revisions control file exists, then set the source to be the way it was before it was compiled

git-svn-id: https://rebeccablackos.svn.sourceforge.net/svnroot/rebeccablackos@2983 56e3d1a8-0179-4092-b3e2-9fbbcda0c0a9
Export a snapshot of the current SVN source in a tar.gz as well

git-svn-id: https://rebeccablackos.svn.sourceforge.net/svnroot/rebeccablackos@2984 56e3d1a8-0179-4092-b3e2-9fbbcda0c0a9