Update BWV 988 var06

bar10: middle voice in treble "a16"-> a8
bar15: bass "a" should be octave lower
bar25: bass "b" should be octave lower
bar19: top voice "a" should be tied to the B section
bar35: top voice "a" should be tied over to the repeat
bar36: (last bar) top voice "g" should be octave lower
(Steve Shorter)
bar 1: top voice add rest
bar14: bass voice add rest
bar17: top voice "g" now tied over to the repeat
bar12: "bes" slur -> tie
bar25: third and last note top voice d->dis
bar22: middle voice g->gis
Update to 2.16.1
Adjust beam, slur, tie directions
Adjust staff positioning
(Javier Ruiz)
Close #59