Add ties from Completion_note_heads_engraver to a TieColumn.

Add ties from Completion_note_heads_engraver to a TieColumn.

* lily/completion-note-heads-engraver.cc (process_music):

  if note splitting causes creation of ties, also create a TieColumn and
  add ties to it to ensure correct formatting in chords

  tidy code

[Neil Puttock, 2011-06-15 20:56:59]

This should improve the appearance of ties in split chords.

[Graham Percival (old account), 2011-06-16 16:26:53]

thanks, added as
http://code.google.com/p/lilypond/issues/detail?id=1697

[Neil Puttock, 2011-06-18 23:01:38]

Pushed: 91ff7544dcefe4fc273559047c72991d207ab5ba