remove-first

[Graham Percival]

I've just changed the default value of RemoveEmptyVerticalGroup's 
remove-first
to set it to #f.  The docs suggest that this is so, and it makes more 
sense to me that
way.

(I've also fixed the docs to reflect the fact that you need to set this 
to #t to remove stuff.)

Just warning you about this; I don't normally touch files outside of 
Documentation/
or input/

Cheers,
- Graham