(svn r12197) -Fix [FS#1788](r12134): show correct last year profit when the train had negative income

-Codechange: use GetDisplayProfitThisYear() to convert vehicle profit to readable form

src/vehicle_base.h

@@ -437,6 +437,18 @@ public:
 	 */
 	Money GetDisplayRunningCost() const { return (this->GetRunningCost() >> 8); }
 
+	/**
+	 * Gets the profit vehicle had this year. It can be sent into SetDParam for string processing.
+	 * @return the vehicle's profit this year
+	 */
+	Money GetDisplayProfitThisYear() const { return (this->profit_this_year >> 8); }
+
+	/**
+	 * Gets the profit vehicle had last year. It can be sent into SetDParam for string processing.
+	 * @return the vehicle's profit last year
+	 */
+	Money GetDisplayProfitLastYear() const { return (this->profit_last_year >> 8); }
+
 	/**
 	 * Set the next vehicle of this vehicle.
 	 * @param next the next vehicle. NULL removes the next vehicle.