[merge] trivially add KnitVersionedFiles repr

[Martin Pool]

This class does sometimes occur in errors like

bzr: ERROR: Revision
{('mbp at sourcefrog.net-20080502082540-jf964t0zy107xut2',)} not present
in "<bzrlib.knit.KnitVersionedFiles object at 0x8d0394c>".

it would be useful to know just where the problem is.

-- 
Martin <http://launchpad.net/~mbp/>
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