Broadcast articulations not in EventChord (issue 5528111)

[mtsolo]

I would advise not handling it this way - the function to_event is
supposed to take music and return an event.  In this patch, it is taking
music, returning an event, and maybe broadcasting music and/or sending
it to a context.

I'd recommend creating a new iterator, rhythmic-music-iterator, that
inherits from Simple_music_iterator.  Have this be the constructor for
the NoteEvent and RestEvent (iterator-ctor).  Then, in this iterator,
duriing process_music, have something that looks at an "articulations"
callback of the iterator.  This callback would handle the articulations
list, much like the "elements-callback" handles the elements list (see
the sequential-iterator).  This is more in keeping with the way the code
is written and would make it easier to follow/debug.

Cheers,
MS

http://codereview.appspot.com/5528111/