clean-up of music-pitch rewrite
Merge remote-tracking branch 'remotes/official/master'

Conflicts:
	src/Music/Pitch/Common/Interval.hs
Merge remote-tracking branch 'remotes/official/master'

Conflicts:
	src/Music/Pitch/Common/Interval.hs
Initial work on tuning systems -- syntonic and TET12, both absolute tuning for pitches and relative (ratios) for intervals
Merge remote-tracking branch 'remotes/official/master'