Need some input on a new patch for glissando-friendly stems

[mike]

Hey all,

I'm getting a patch together to implement glissandi stem (stems that link up to 
a glissando to indicate the glissando's duration to avoid awkwardness with ties 
- comes up all the time in Xenakis).
I have the C++ code working, but I'm looking for suggestions on the input 
syntax.  Currently, the input syntax is fairly hackish.  I'm looking for 
suggestions for not-too-ugly ways to input these glissandi stem (especially in 
relative contexts where the note values of the stem will have an impact on the 
next real note).

After I get some feedback, I'll put a patch on Reitveld for more formal 
reviewing.

Thanks!
~Mike

0001-Adds-glissando-stems-to-Lilypond.patch
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glissando-stem.ly
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