Advanced trading selling upgraded vehicles.

These changes allow the player to sell upgraded vehicles with them not
being added to the trader (as to not polute the lists). This basically
refers to an upgraded vehicle as a child of the base vehicle so it will
get the same sell price as the base vehicle.

This still follows the original trading convention, the vehicle base
needs to be in the trader category, i.e you cant sell an armored SUV at
stary vehicle trader.

SQF/dayz_code/Configs/CfgVehicles/Car/CAR_HATCHBACK.hpp

@@ -13,6 +13,7 @@
 
 // Performance 1
 class car_hatchback_DZE1: car_hatchback {
+	original = "car_hatchback";
 	maxspeed = 150; // max engine limit 125-130
 	terrainCoef = 2.5;
 
@@ -84,4 +85,4 @@ class car_hatchback_DZE3: car_hatchback_DZE2 {
 // Fuel 4
 class car_hatchback_DZE4: car_hatchback_DZE3 {
 	fuelCapacity = 210; // car 100
-};
+};