MountFS:  fast-path copy/move/copydir/movedir if src and dst are in same FS
MountFS:  fast-path copy/move/copydir/movedir if src and dst are in same FS


git-svn-id: 74b2def6592cf29d88d1a5d33b5c4a2732d8507c@321 67cdc799-7952-0410-af00-57a81ceafa0f

atty303/pyfilesystem,lightkeeper/lspyfilesystem,lightkeeper/lspyfilesystem