added: SessionContainer special container used by SessionManager

sessions are indexed by id and time (last used time)
changed: old sessions are deleted
       parameter: session_max_iddle in the config file
added: function 'who'


git-svn-id: svn://ttmath.org/publicrep/cmslu/trunk@483 e52654a7-88a9-db11-a3e9-0013d4bc506e

core/session.h

@@ -25,8 +25,16 @@ struct Session
 	long id;
 	
 	// when this session was created
-	int time;
+	// (the same values)
+	time_t time;
+	tm tm_time;
+	
+	// when this session was last used
+	// (the same values)
+	time_t last_time;
+	tm tm_last_time;
 
+	
 	// 0 - means that nobody is logged	
 	User * puser;