(svn r1108) -Fix: [Network] Fixed problem around slow clients:

They joined, they got the map, but it took some time before the new 
player was created. In this time a player could do stuff, causing a 
player-id-mismatch, and the player was kicked out. Now a player get's a 
nice GUI which says: registering.. When that is gone, the player is 
joined and can play safely. Tnx to Moriarty for bugging me with this bug ;)

network_gui.c

@@ -1271,6 +1271,15 @@ void ShowJoinStatusWindow()
 	AllocateWindowDesc(&_network_join_status_window_desc);
 }
 
+void ShowJoinStatusWindowAfterJoin()
+{
+	/* This is a special instant of ShowJoinStatusWindow, because
+	    it is opened after the map is loaded, but the client maybe is not
+	    done registering itself to the server */
+	DeleteWindowById(WC_NETWORK_STATUS_WINDOW, 0);
+	_network_join_status = NETWORK_JOIN_STATUS_REGISTERING;
+	AllocateWindowDesc(&_network_join_status_window_desc);
+}