Working
-in createGame, addededge removal. It works, though only sometimes...
Working
-createGame: previous problem is fixed. eraseEdges works now
Working
-createGame: corrected a console log message
Working
-createGame: did part of the map randomization
Working (except random in createGame)
in createGame: 
-added several new functions
-optimized a couple of old functions
-developed random tool further: still didn't finish, so it's not working