* lily/melisma-engraver.cc (try_music): use melisma_busy()

* lily/melisma-engraver.cc (try_music): use melisma_busy()

* lily/lyric-engraver.cc (process_music): remove alignment kludge

* lily/lyric-combine-music-iterator.cc (melisma_busy): new function.

* lily/stanza-number-engraver.cc (acknowledge_grob): rewrite

* scm/define-grobs.scm (all-grob-descriptions): change
StanzaNumber description: make side support, i.s.o. breakable.
use Instrument_name_engraver for texts in the margin.

* scm/define-translator-properties.scm: remove
melismaEngraverBusy, stz property.

* lily/self-aligment-interface.cc (aligned_on_parent): new function.

* input/regression/lyric-phrasing-new.ly: new file.

* lily/new-phrasing-engraver.cc (process_acknowledged_grobs): new
engraver, redo lyric phrasing, but cleaner and simpler.  Lyrics on
melismata are now left-aligned.