Rename file to f (avoid collision with python builtin).
Various graphical adjustments (mostly graphical) and bug fixes.
	- changed all classes to 'new style python classes'
	- renamed Object to GameObject to avoid collision with object
	- fixed map border off-by-one error
	- fixed map_console not being cleared
	- fixed GameObject.move() off-by-one near map border
	- GameObject.draw() now changes char for seen_by_player/unseen
	- fixed swapped 'j' and 'k' in vi-keys
Renamed pd.py back to petaldeny.py (already used by puredata program).