* Documentation/user/instrument-notation.itely (Laissez vibrer

* Documentation/user/instrument-notation.itely (Laissez vibrer
ties): new node.

* input/regression/laissez-vibrer-ties.ly: new file.

* lily/laissez-vibrer-engraver.cc: new file.

* lily/include/tie-column-format.hh: new file.

* lily/tie-column-format.cc: new file.

* lily/tie-column.cc (set_manual_tie_configuration): new function.

* lily/laissez-vibrer-tie.cc: new file.

* lily/include/laissez-vibrer-tie.hh: new file.

* ly/engraver-init.ly: add Laissez_vibrer_engraver

* ly/declarations-init.ly (laissezVibrer): add \laissezVibrer

* scm/define-grobs.scm (all-grob-descriptions): add
LaissezVibrerTie, LaissezVibrerTieColumn

* lily/tie-column.cc (set_tie_config_directions): new function
(final_shape_adjustment): new function.
(shift_small_ties): new function.

* scm/define-music-types.scm (music-descriptions): add LaissezVibrerEvent

* lily/include/tie.hh (struct Tie_details): add x_gap_
(struct Tie_configuration): add head_position_

* lily/tie-column.cc (set_chord_outline): new function.

* mf/cmr.enc.in:  remove file.