Fix Advanced Trading Selling + new Var

New variable to configure whether or not the player will need to key to
sell a vehicle. DZE_SaleRequiresKey = false;

SQF/dayz_code/configVariables.sqf

@@ -50,6 +50,7 @@ DZE_GodModeBaseExclude = []; //Array of object class names excluded from the god
 DZE_advancedTrading = true; //Use advanced trading system. WARNING: set to false if you use database traders, you should use config-traders anyway!
 DZE_serverLogTrades = true; // Log trades to server RPT (sent with publicVariableServer on every trade)
 DZE_GemWorthArray = [["ItemTopaz",15000], ["ItemObsidian",20000], ["ItemSapphire",25000], ["ItemAmethyst",30000], ["ItemEmerald",35000], ["ItemCitrine",40000], ["ItemRuby",45000]]; //array of gem prices, works only in advanced trading
+DZE_SaleRequiresKey = false; //Require the player has the key for a vehicle in oreder to sell it. The key can be in the player's toolbelt or backpack, or the vehicle's inventory. False by default
 Z_AT_FolderLocation = '\z\addons\dayz_code\actions\AdvancedTrading';
 Z_VehicleDistance = 40; // Distance that a vehicle needs to be to see it's content or to sell it.
 Z_SingleCurrency = false; // Does your server use a single currency system.