Issue 1060 -- add Funk and Walker noteheads to shape notes (issue1697056)

[Carl . D . Sorensen]

Reviewers: ,

Message:
I've created a patch to add Funk and Walker noteheads to the shape note
capability of LilyPond.

I've also updated the documentation to reflect this.

Please review,

Thanks,

Carl

Description:
Issue 1060 -- add Funk and Walker noteheads to shape notes
Add a series of Funk and Walker note heads to mf/feta-noteheads.mf

Add new commands \funkHeads, \funkHeadsMinor, \walkerHeads, and
\walkerHeadsMinor

Add regression test for \funkHeads and \walkerHeads

Update Notation to reflect the addition of \funkHeads and \walkerHeads

Please review this at http://codereview.appspot.com/1697056/show

Affected files:
  M Documentation/notation/pitches.itely
  A input/regression/note-head-funk.ly
  A input/regression/note-head-walker.ly
  M ly/property-init.ly
  M mf/feta-noteheads.mf