(svn r18266) -Codechange: Add a function to compute prices from price base and cost factor and use it consistently for vehicle purchase, running cost, and refit cost.

src/economy_func.h

@@ -41,7 +41,7 @@ uint MoveGoodsToStation(CargoID type, uint amount, SourceType source_type, Sourc
 void PrepareUnload(Vehicle *front_v);
 void LoadUnloadStation(Station *st);
 
-Money GetPriceByIndex(Price index);
+Money GetPrice(Price index, uint cost_factor, int shift = 0);
 
 void InitializeEconomy();
 void RecomputePrices();