(svn r18404) -Codechange: link drive through stops better together

-Feature: make penalty for road stop occupancy user configurable
-Fix [FS#1944]: road vehicles would not pick an empty drive through stop. Now they will *if* the penalty for driving around is less than the occupancy penalty
-Fix [FS#1495]: long (articulated) road vehicles could block loading of others when the following road vehicle already got 'permission' to go to the next bay even when it could not reach it
-Change: improve the throughput of the drive through road stops by letting them stop closer together

src/saveload/oldloader_sl.cpp

@@ -190,7 +190,7 @@ void FixOldVehicles()
 		if (v->type == VEH_ROAD) {
 			RoadVehicle *rv = RoadVehicle::From(v);
 			if (rv->state != RVSB_IN_DEPOT && rv->state != RVSB_WORMHOLE) {
-				ClrBit(rv->state, RVS_IS_STOPPING);
+				ClrBit(rv->state, 2);
 			}
 		}