(svn r3081) -Codechange: [autoreplace] complete rewrite of autoreplace

this is a complete rewrite, that makes use of existing commands like build and sell
        this means that multiheaded train engines are replaced correctly

roadveh_cmd.c

@@ -1521,7 +1521,7 @@ void RoadVehEnterDepot(Vehicle *v)
 
 	InvalidateWindow(WC_VEHICLE_DETAILS, v->index);
 
-	MaybeReplaceVehicle(v);
+	v = MaybeReplaceVehicle(v);
 
 	VehicleServiceInDepot(v);