RFC: \hideNote

[Adam Spiers]

I noticed that we already have \hideNotes and \unHideNotes, but that
is rather clumsy when you only want to hide a single note.  So I wrote
a patch to add \hideNote, and as a newbie to Lilypond development I
wanted to check that this was a sensible idea.  The patch is here,
although I haven't tested it properly yet because I'm still getting to
grips with the regression test suite:

  
https://github.com/aspiers/lilypond/commit/125c734efa2815e358815cdd912acad81940c776

It adds one sentence to the documentation which would need
translating.