* scm/define-context-properties.scm:

* scm/define-context-properties.scm:
* scm/define-grob-properties.scm:
* scm/define-grobs.scm:
* scm/define-music-display-methods.scm:
* scm/define-music-properties.scm:
* scm/define-music-types.scm:
* scm/music-functions.scm:
* ly/declarations-init.ly:
* lily/include/constrained-breaking.hh:
* lily/system.cc:
* lily/spaceable-grob.cc:
* lily/simple-spacer.cc:
* lily/paper-score.cc:
* lily/paper-column.cc:
* lily/paper-column-engraver.cc:
* lily/item.cc:
* lily/gourlay-breaking.cc:
* lily/constrained-breaking.cc:
* python/convertrules.py:
Change "penalty", "page-penalty" and "breakable" to "line-break-penalty",
"page-break-penalty" and "line-break-permission".
Add "page-break-permission", "page-turn-permission" and "page-turn-penalty".
Replace BreakEvent with LineBreakEvent, PageBreakEvent and PageTurnEvent.

* lily/bar-engraver.cc:
* lily/beam-engraver.cc:
* lily/forbid-break-engraver.cc:
* lily/ligature-engraver.cc:
* lily/paper-column-engraver.cc:
* lily/percent-repeat-engraver.cc:
* lily/score-engraver.cc:
* lily/score-engraver.hh:
* lily/paper-column-engraver.hh:
Inter-engraver communication regarding line breaks is done through context
properties (Score.forbidBreak) instead of function calls.