added: privileges (user, groups, permissions)

(not finished yet)
       classes: User, Group, Users, Groups, UGContainer
changed: Dir class into Dirs


git-svn-id: svn://ttmath.org/publicrep/cmslu/trunk@467 e52654a7-88a9-db11-a3e9-0013d4bc506e

core/session.cpp

@@ -23,8 +23,8 @@ void Session::Clear()
 	id      = 0;
 	time    = 0;
 	is_logged = false;
-	user_id = 0;
-	user.clear();
+	user_id = -1;
+	puser   = 0;
 	done = Done::none;
 	done_status = Error::ok;
 	item.Clear();