sorting items in a directory (Item::sort_index is used) git-svn-id: svn://ttmath.org/publicrep/winix/trunk@754 e52654a7-88a9-db11-a3e9-0013d4bc506e
git-svn-id: svn://ttmath.org/publicrep/winix/trunk@716 e52654a7-88a9-db11-a3e9-0013d4bc506e