Enhancement: tabalture chord repetition (issue224082)

[nicolas . sceaux]

http://codereview.appspot.com/224082/diff/1/3
File ly/chord-repetition-init.ly (right):

http://codereview.appspot.com/224082/diff/1/3#newcode51
ly/chord-repetition-init.ly:51: #(define-public (tab-repeat-chord
previous-chord location duration articulations)
It would be  better to define a generic repetition function, taking the
event types that should be kept for NoteEvents. default-repeat-chord and
tab-repeat-chord would then use this function.  I'm writing it on other
post.

http://codereview.appspot.com/224082/show