* lily/accidental-engraver.cc: rewrote accidental-routines to get
support for cross-context auto-accidentals.
Now the engraver can stay in Staff-context and see other contexts
from there.
Changed properties: autoAccidentals, autoCautionaries
* lily/translator-group.cc (set_children_property):
Function added recursively setting the same property (deep_copied)
for all children of a Translator_group.