Re: renaming "vertical spacing inside systems" props

[Mark Polesky]

You guys are going to *hate* me for doing this, but I just
thought of a way to keep the StaffGrouper grobs consistent
with each other.

Instead of these two:

  withingroup-staff-staff-spacing
  staffgroup-staff-spacing

we could have these:

  within-group-staff-staff-spacing
  below-group-staff-staff-spacing
    (or after-group-...)

or these:

  inside-group-staff-staff-spacing
  outside-group-staff-staff-spacing

Hopefully the lot of you will either
  1) love this,
  2) hate this, or
  3) stop caring!

Otherwise I guess we'll keep on voting.  I expressly tried
to do this in a way to keep voting to a minimum.  Obviously
I completely failed.  Thoughts?

- Mark

p.s. "withingroup" was in the lead...