(svn r21933) -Codechange: Split cur_order_index into cur_auto_order_index and cur_real_order_index to keep track of the current real order in an unambiguous way.

-Fix [FS#4440]: Automatic orders behave now stable wrt. service orders and are not added or removed depending on the need of servicing.
-Fix: Various other issues with automatic orders, e.g. vehicles getting stuck with "no orders" when there are automatic orders at the end of the order list.

src/roadveh_cmd.cpp

@@ -525,7 +525,7 @@ TileIndex RoadVehicle::GetOrderStationLocation(StationID station)
 	const Station *st = Station::Get(station);
 	if (!CanVehicleUseStation(this, st)) {
 		/* There is no stop left at the station, so don't even TRY to go there */
-		this->IncrementOrderIndex();
+		this->IncrementRealOrderIndex();
 		return 0;
 	}