Issue 3878: Revert "Fix spurious error playing initial grace notes (issue 1412)"

This reverts commit 6cec57bf0989098fce173703b894f7718bf9c10d.
Add dodecaphonic-first accidental style

This accidental style assigns accidentals to _all_ pitches
(just as dodecaphonic does) but remembers them throughout
a whole measure.
This style is useful for different styles of contemporary notation
that want to make use of the non-tonal dodecaphonic style but don't
want to print so many redundant accidentals.
Add doc for dodecaphonic-first accidental style