(svn r2625) - Fix: [pbs] Store the end of a train's reserved path explicitly. Prevents trains from unreserving eachothers paths in some cases.

- CodeChange: Use the TrackdirToTrack function instead of &7, and remove an unneeded variable.

vehicle.h

@@ -70,6 +70,8 @@ typedef struct VehicleRail {
 	byte flags;
 
 	byte pbs_status;
+	TileIndex pbs_end_tile;
+	Trackdir pbs_end_trackdir;
 } VehicleRail;
 
 enum {