Miscellaneous fixes:

- proper block of "back" button in campaign menu.
- proper block of AI switch in battles
- vertical garrisons can now be attacked from top
- better UI logging, vcmi will print to log file all pressed buttons
- server will not try to build already existing building

lib/CDefObjInfoHandler.cpp

@@ -35,6 +35,7 @@ static bool isVisitableFromTop(int identifier, int type)
 		Obj::BOAT,
 		Obj::WHIRLPOOL,
 		Obj::GARRISON,
+		Obj::GARRISON2,
 		Obj::SCHOLAR,
 		Obj::CAMPFIRE,
 		Obj::BORDERGUARD,