Add support to reset the downloaded source from scratch

git-svn-id: https://rebeccablackos.svn.sourceforge.net/svnroot/rebeccablackos@3277 56e3d1a8-0179-4092-b3e2-9fbbcda0c0a9
libnm-qt got renamed

git-svn-id: https://rebeccablackos.svn.sourceforge.net/svnroot/rebeccablackos@3278 56e3d1a8-0179-4092-b3e2-9fbbcda0c0a9