fix bug in triplet conversion from humdrum to musicxml and back in.

git-svn-id: http://music21.googlecode.com/svn/trunk@3358 5c16147e-a200-11de-b0cc-ab0ad15e60d0
fixed chordify problem with addPartIdAsGroup where there were already chords in the original piece.

git-svn-id: http://music21.googlecode.com/svn/trunk@3359 5c16147e-a200-11de-b0cc-ab0ad15e60d0
Added JRP flavor to spineParser and a rudimentary TupletFixer to duration

git-svn-id: http://music21.googlecode.com/svn/trunk@3360 5c16147e-a200-11de-b0cc-ab0ad15e60d0