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

* lily/beam-engraver.cc: move new-beam-event to beam-event

* lily/tie-engraver.cc (class Tie_engraver): move New_tie_engraver
to Tie_engraver

* lily/parser.yy (Composite_music): add \newcontext

* lily/text-item.cc: remove old-style markups.
(interpret_markup): C++ version of markup function
(brew_molecule): idem.