(svn r2079) -Add: signlist, shows all signs in the map. Clicking on them, and you go

to the sign. Very needed for coop. You can find it under World Map.

gui.h

@@ -75,6 +75,7 @@ void ShowSubsidiesList(void);
 void ShowPlayerStations(int player);
 void ShowPlayerFinances(int player);
 void ShowPlayerCompany(int player);
+void ShowSignList(void);
 
 void ShowEstimatedCostOrIncome(int32 cost, int x, int y);
 void ShowErrorMessage(StringID msg_1, StringID msg_2, int x, int y);