doc build needs funkiness

[Graham Percival]

Hi Carl,

Could you add the Funk noteheads to
  Documentation/included/font-table.ly
?  Maybe something like this:

  (define funk-noteheads
    (get-group glyph-list
      "^noteheads.*Funk*$"))

... and then calling that function in the places that such functions
are called, lower down in the file?  Currently the doc build dies on
this file because we (deliberately) made it die if there were any
unlisted glyphs.

Cheers,
- Graham