[merge] trivially add KnitVersionedFiles repr

[John Arbash Meinel]

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Martin Pool wrote:
> 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.
> 
> 

BB:approve

Though I might expect it won't give you quite enough info still. (Unless
the Access objects also have appropriate reprs.)

John
=:->
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