Changed clefs collide with multimeasure rests

[Paul Scott]

I didn't see this in the bug list.  I'm thinking it started with 2.13.30 but 
I'm not sure.

The following code shows new clefs overlapping the non-church multimeasure rest 
"lines."
\version "2.13.30" 

{ 
  \compressFullBarRests \override Score.MultiMeasureRest #'expand-limit = #1 
  a'1 R1*2 \clef bass R1*2 b1 b1 R1*2 \clef treble R1*10 
}

Paul Scott