Merge branches 'upgrade_airport' and 'vehicle_group_info' into jgrpp

src/saveload/vehicle_sl.cpp

@@ -375,6 +375,8 @@ void AfterLoadVehicles(bool part_of_load)
 	FOR_ALL_VEHICLES(v) {
 		assert(v->first != NULL);
 
+	  v->trip_occupancy = CalcPercentVehicleFilled(v, NULL);
+
 		switch (v->type) {
 			case VEH_TRAIN: {
 				Train *t = Train::From(v);