Bar numbers for broken measures

[Daniel Rosen]

The piece I'm working on has a repeat that ends in the middle of a measure, 
with a line break at the same point:

\version "2.16.0"
\relative c' { \time 4/4 \repeat volta 2 {  c d e } \break f | g a b } \paper { 
ragged-right = ##t }

I would like to have a bar number, perhaps in parentheses, at the beginning of 
the second line, as in this example (sorry for the poor image quality): 
http://j.mp/QyEsTT. How can I make this happen? I've been combing through the 
list archives to no avail.

DR