mensural notation

[Pal Benko]

Hi all,

attached is a patch with changed mensural noteheads.

Some problems:
1. MensuralStaff sort of ceased to work for me - or, rather,
I was using it inaccurately.  Roughly I wrote

\score {
  \context MensuralStaff {
    % notes here
  }
}

But since last week this doesn't work.

2. I'd like to make punctus divisionis work as a new bar symbol,
\bar ".".  But for correct positioning I need in
Bar_line::compound_barline the previous and the next note - how
can I get them (if I can at all)?

3. I hacked Mensural_ligature a bit so that now I don't have
those spurious warnings for flexa shapes and I have horizontal
positioning of dots all right.  I want to have correct vertical
positions; in Mensural_ligature I can calculate the correct
position, but I don't know how to propagate this information
(and in fact I don't really know where to propagate it, but I
guess it's Dot_column or Dot_column_engraver).

thanks,
Pal
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patch3
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