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

	* scm/define-music-types.scm (music-descriptions): remove
	BreakEvent and fix {Page,Line}{Break,Turn}Event so
	Music::to_event doesn't complain.

	* lily/accidental-placement.cc (ape_compare):
	* lily/semi-tie.cc (compare):
	* lily/note-column.cc (shift_compare): replace by XXX_less

	* lily/tie-formatting-problem.cc (set_chord_outline):
	* lily/tie-column.cc (calc_positioning_done):
	* lily/system.cc (post_processing)
	(get_paper_system):
	* lily/stem.cc (note_head_positions)
	(calc_positioning_done):
	* lily/spanner.cc (do_break_processing)
	(find_broken_piece):
	* lily/span-bar.cc (print):
	* lily/semi-tie-column.cc (calc_positioning_done):
	* lily/rest-collision.cc (calc_positioning_done):
	* lily/program-option.cc (get_help_string):
	* lily/note-collision.cc (get_clash_groups):
	* lily/new-fingering-engraver.cc (position_scripts):
	* lily/keyword.cc (Keyword_table):
	* lily/hara-kiri-group-spanner.cc (request_suicide):
	* lily/grob-pq-engraver.cc (stop_translation_timestep):
	* lily/accidental-placement.cc (calc_positioning_done):
	(stagger_apes):
	* lily/beam.cc (get_beam_segments):
	* lily/grob-array.cc (remove_duplicates):
	use new vector_sort

	* input/mutopia/W.A.Mozart/mozart-hrn3-defs.ily:
	ragged-last-bottom = ##f (test the new page breaker)

	* flower/include/std-vector.hh (vector_sort): use STL sort stuff

	* scm/define-context-properties.scm
	(all-internal-translation-properties): remove properties that
	were used to communicate page-turn stuff to the paper-column
	engraver.

	* lily/lily-guile.cc (robust_scm2string): new function

	* lily/paper-column-engraver.cc: Clean up page turn stuff

	* lily/page-turn-engraver.cc: Re-write the page turn logic here
	instead of cluttering up paper-column-engraver.cc