(svn r17433) -Codechange: Store cumulated inflation in savegame and compute all prices from that instead of storing all prices separately.

Note: Savegame conversion computes the inflation from max loan. Prices from modified savegames will get lost. TTO savegames will also behave slightly different.
-Change: NewGRF price modifiers now take effect everytime when loading NewGRFs instead of once on gamestart.

src/economy_func.h

@@ -24,16 +24,12 @@
 
 void ResetPriceBaseMultipliers();
 void SetPriceBaseMultiplier(uint price, byte factor);
-void ResetEconomy();
 
 extern const ScoreInfo _score_info[];
 extern int _score_part[MAX_COMPANIES][SCORE_END];
 extern Economy _economy;
 /* Prices and also the fractional part. */
 extern Prices _price;
-extern uint16 _price_frac[NUM_PRICES];
-extern Money  _cargo_payment_rates[NUM_CARGO];
-extern uint16 _cargo_payment_rates_frac[NUM_CARGO];
 
 int UpdateCompanyRatingAndValue(Company *c, bool update);
 void StartupIndustryDailyChanges(bool init_counter);
@@ -46,4 +42,8 @@ void LoadUnloadStation(Station *st);
 
 Money GetPriceByIndex(uint8 index);
 
+void InitializeEconomy();
+void RecomputePrices();
+void AddInflation(bool check_year = true);
+
 #endif /* ECONOMY_FUNC_H */