(svn r15077) -Codechange: enumify DAYS_IN_YEAR and DAYS_IN_LEAP_YEAR

-Change: when computing daily running cost, divide by 365 (instead of 364). Since r12134, the rounding errors don't need this correction anymore

src/ai/api/ai_engine.cpp

@@ -186,7 +186,7 @@
 {
 	if (!IsValidEngine(engine_id)) return -1;
 
-	return ::GetEngine(engine_id)->lifelength * 366;
+	return ::GetEngine(engine_id)->lifelength * DAYS_IN_LEAP_YEAR;
 }
 
 /* static */ Money AIEngine::GetRunningCost(EngineID engine_id)

src/ai/api/ai_engine.hpp

@@ -117,7 +117,7 @@ public:
 	 * @param engine_id The engine to get the running cost of.
 	 * @pre IsValidEngine(engine_id).
 	 * @return The running cost of a vehicle per year.
-	 * @note Cost is per year; divide by 364 to get per day.
+	 * @note Cost is per year; divide by 365 to get per day.
 	 */
 	static Money GetRunningCost(EngineID engine_id);
 

src/ai/api/ai_event_types.hpp

@@ -286,7 +286,7 @@ public:
 	/**
 	 * Get the running cost of the offered engine.
 	 * @return The running cost of the vehicle per year.
-	 * @note Cost is per year; divide by 364 to get per day.
+	 * @note Cost is per year; divide by 365 to get per day.
 	 */
 	Money GetRunningCost();
 

src/ai/api/ai_vehicle.hpp

@@ -218,7 +218,7 @@ public:
 	 * @param vehicle_id The vehicle to get the age of.
 	 * @pre IsValidVehicle(vehicle_id).
 	 * @return The running cost of the vehicle per year.
-	 * @note Cost is per year; divide by 364 to get per day.
+	 * @note Cost is per year; divide by 365 to get per day.
 	 * @note This is not equal to AIEngine::GetRunningCost for Trains, because
 	 *   wagons and second engines can add up in the calculation too.
 	 */