[PATCH] Allow music identifiers in \addlyrics (no need for braces any more)

[Reinhold Kainhofer]

Allow music identifiers in \addlyrics (no need for braces any more)

In particular, so far the following did not work:
    \new Staff { \m \addlyrics \l }
Instead, one had to use braces around \m and \l:
    \new Staff { {\m} \addlyrics {\l} }

This patch extends the parser to allow music identifiers, too,
so that no braces are needed any more.

http://codereview.appspot.com/2740044

Okay to push?

Cheers,
Reinhold
-- 
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Reinhold Kainhofer, address@hidden, http://reinhold.kainhofer.com/
 * Financial & Actuarial Math., Vienna Univ. of Technology, Austria
 * http://www.fam.tuwien.ac.at/, DVR: 0005886
 * LilyPond, Music typesetting, http://www.lilypond.org