Re: Treat accidentals parentheses as cautionary (issue 6310065)

[janek . lilypond]

So until now cautionary accidentals *were* supported - the problem was
just that the software that exported mxls didn't mark them
appropriately?  I.e. they had parentheses around them, but didn't have
appropriate property set?
That's an interesting example of how WYSIWYG sucks.

LGTM

http://codereview.appspot.com/6310065/