fix package/symlinks target, will call scripts/feeds update / install...

fix package/symlinks target, will call scripts/feeds update / install introduce new package/symlinks-install and package/symlinks-clean targets - package/symlink-install will re-create the index files and the symlinks for all ./feeds (no update from repositories is performed) - package/symlink-clean will delete all installed symlinks (keeping the ./feeds untouched)

SVN-Revision: 10634