(svn r15340) -Fix [FS#2121]: changing town road layout in-game caused ugly road networks

-Fix: use a flag instead of TL_NO_ROADS to forbid towns to build roads. The flag is ignored during world generation, so there won't be 'ghost' towns anymore
-Feature: town layout is now stored per town, so it is possible to (manually) set different layout for each town

src/saveload/saveload_internal.h

@@ -21,7 +21,6 @@ void FixOldWaypoints();
 void AfterLoadWaypoints();
 void AfterLoadVehicles(bool part_of_load);
 void AfterLoadStations();
-void AfterLoadTown();
 void UpdateHousesAndTowns();
 
 void UpdateOldAircraft();