(svn r9874) -Feature: advanced vehicle lists a.k.a. group interface. Now you can make groups of vehicles and perform all kinds of tasks on that given group. Original code by nycom and graphics by skidd13.

src/vehicle.h

@@ -310,6 +310,8 @@ struct Vehicle {
 	TileIndex cargo_loaded_at_xy;  ///< tile index where feeder cargo was loaded
 	uint32 value;
 
+	GroupID group_id;              ///< Index of group Pool array
+
 	union {
 		VehicleRail rail;
 		VehicleAir air;