grob creation

[Rune Zedeler]

In order to fix the remaining accidental bugs I need to wait creating 
the accidentals grobs until all accidentals - in ALL contexts (!) in the 
current translation timestep has been acknowledged.
How is this possible?

I mean, afaics what happens is:

For each timestep:
  - All engravers are initialized (start_translation_timestep)
  - In no special order (?) grobs are acknowledged and created in the 
different engravers.
  - All engravers are finalized (stop_translation_timestep)

I would like to be able to create grobs - one time in each translator - 
after all ackowledgements are done. How do I do that? I don't assume 
that doing it in the stop-translation-timestep phase is safe...?


-Rune