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Issue 4718/1: In-chord tie in cue causes segfault
This extends transposition functionality from Music expressions to
Prob in general since Stream_event also needs transposition in the
context of quoted music. While at top level, Stream_event is
processed using the container-agnostic transpose_mutable, this does
not extend to the actual contents, and at least a Stream_event's
articulation list does not consist of Music expressions but again of
Stream_event elements.
Also contains commits:
Issue 4718/2: Let transpose_music_list act defensively for non-Prob members
Issue 4718/3: Let Quote_iterator::process use Prob::transpose
Issue 4718/4: Fold transpose_mutable into Prob::transpose
It's not really needed elsewhere anymore.
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