[PATCH] Fix #628 and allow \note(-by-number) to work with all head styles.

[Neil Puttock]

Hi everybody,

This patch does two things:

1) Fix issue #628, whereby grob 'style settings (e.g., TextSpanner
#'style = #'trill) interfere with the default notehead style for
\note(-by-number);

2) Use the code from note-head::calc-glyph-name to ensure all notehead
style can be set via 'style in \note(-by-number).

Please review here: http://codereview.appspot.com/174073

Thanks,
Neil

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