Re: printing "a 2" at the beginning of staves automatically

[Werner LEMBERG]

>>> Meanwhile, how about using a spanner rather than an item?  See
>>> attached.
> 
> Aaand some nits :-)

I forget another one.

* If you look at the attached image (from 'Carmina burana') it
  probably makes sense to have the staff annotation engraver actually
  live in the Voice context.  We should thus have a different name, I
  guess.


     Werner