Re: Add chordChanges capability to FretBoard grobs

[n . puttock]

http://codereview.appspot.com/24044/diff/1/2
File input/new/fretboard-chordchanges.ly (right):

http://codereview.appspot.com/24044/diff/1/2#newcode8
Line 8: \version "2.13.0"
"2.13.1"

http://codereview.appspot.com/24044/diff/1/3
File input/regression/fretboard-chordchanges.ly (right):

http://codereview.appspot.com/24044/diff/1/3#newcode8
Line 8: \version "2.13.0"
"2.13.1"

http://codereview.appspot.com/24044/diff/1/5
File lily/fretboard-engraver.cc (right):

http://codereview.appspot.com/24044/diff/1/5#newcode39
Line 39: SCM last_fret_notes_;
scm_gc_mark () to prevent garbage collection?

http://codereview.appspot.com/24044/diff/1/6
File ly/engraver-init.ly (right):

http://codereview.appspot.com/24044/diff/1/6#newcode24
Line 24: \consists "Separating_line_group_engraver"
Instrument_name_engraver?

http://codereview.appspot.com/24044