better names for modes
rm clutter comments
'as' instead of ',' in except statement

2to3 suggestion
more 2to3 suggestions
minor refactoring
Re-factored mixers into classes

Inspired by code by marvinthepa.

Conflicts:
	cplay
Fix unnecessary screen refreshing

Apparently, the st_mtime attribute of a os.stat call is not the same as the corresponding tuple element (float vs. integer).
This caused unnecessary refreshes. Fix is to coerce to int.
Fixes issue #1.

Conflicts:
	cplay