Adjusting intersystem spacing with FretDiagrams context

[Carl Sorensen]

I've succeeded in getting a fret diagram out of a FretDiagrams context. 
(The Fret_diagram_engraver is hard-coded to only produce a single
diagram for now, but it still lets me test out contexts).

Here's the .ly file:

\score{
  <<
    \chords{d}
    \new FretDiagrams {d}
    \chordmode{d}

  >>
}

I've got the output two different sizes (I changed size by adding a size
property to FretDiagram in scm/define-grobs.scm).

The problem I'm seeing right now is that the ChordName is running into
the FretDiagram.  It seems that the inter-system spacing isn't
appropriate.  But it changes with the size of the FretDiagram, so
perhaps I just don't have some padding right.

Any thoughts on what I would tweak to increase the spacing between the
ChordName and the FretDiagram?

Thanks,

Carl

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