Breve Notation

[Peter Leschev]

Hi!

           We're in need of being able produce music with the following 
type of breve:

http://en.wikipedia.org/wiki/Image:Breve_notation.png
       (The one on the left, the one with 2 parallel vertical lines on each 
side).

> From what I can tell this is currently not supported - The closest is a 
breve with 1 vertical line on each side.
(http://www.lilypond.org/doc/v2.5/input/regression/out-www/collated-files.html#note-head-style.ly) 
- Is support for this intended? Can someone point me in the right direction 
to implement it myself?


Cheers,
Peter