bzr shelve/unshelve should test the availability of diffstat before running it

[Aaron Bentley]

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Michael Ellerman wrote:
> Sweet. Actually if you want to pull my new code into bzrtools every now and 
> then that'd be fine too, whatever's easiest.

I'll be glad to.  Right now, it's not passing the selftest for a variety
of reasons, but let me know when it's ready.

Aaron
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