pyflakes cleanups and some refactors
Ignore-this: f7372e678699175feb4e628eee3d768c

2to3 with these fixers: all idioms set_literal
Ignore-this: cbd28518218c2f0ddce8c4f92d3b8b33

reformat all python
Ignore-this: 1135b78893f8b3d31badddda7f45678f

fix up musicpad and wavecurve. ascoltami2 can now use relative paths in the config
Ignore-this: eb95f50f54f14275f1f031ccb7fbb97f

fix wavecurve
Ignore-this: 49aff50aa4bcbb6fe0aec412c46d7911

move networking settings to config.n3
Ignore-this: 42a6390f9354a171c4d43e1c65a551ca

create Playlist class which is now used in wavecurve, musicPad, and ascoltami2.
Ignore-this: da54d0239906e81ad5d95741d22f5975
Several other refactorings. Also, totally untested.