[MERGE] 'bzr selftest --clean' allows easily clean temporary tests directories

[Aaron Bentley]

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John Arbash Meinel wrote:
> I'm not sure if 'selftest' is the right place to put something like this.
> 
> We do have 'bzr clean-tree' and 'bzr clean-tree --detritus' as part of
> bzrtools. 'bzr clean-tree --detritus' removes all of the .~1~ files, as
> well as the test directories.

Personally, I'll keep using clean-tree --detritus, but I don't have a
problem with this.  Since selftest can dump junk in your workingtree,
it's nicely symmetrical to provide a related way to clean up said junk.

Ironically, my desire to clean up test directories is what kept this
functionality out of bzr in the first place.  Because that functionality
is specific to bzr development, so it wasn't deemed general enough.  But
I hardly see how anyone can object to it when clearly tied to the
selftest command.

Aaron
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