horizontal skylines, span-bar-stubs, and SystemStartBars

[address@hidden]

Hey all,

I've been trying to clean up some of the new SpanBarStub code so that it works 
for the beginnings of systems too.  In the attached file, you'll see that when 
the clefs and bar lines are removed from the system, the lyrics butt up against 
the SystemStartBar.  Furthermore, it seems like the horizontal skylines are 
outta whack, either because they're being printed wrong or because they're 
legitimately wrong.

The most important task, for now, is to get lyrics not colliding with the 
SystemStartBar.  I've been toying around with trying to give a Y-extent to this 
grob, but even that doesn't seem to work.  Does anyone have any suggestions for 
how to do this?

Cheers,
MS

span-bar-allow-span-bar.ly
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