[MERGE/RFC] Merge in clean-tree

[Aaron Bentley]

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Jelmer Vernooij wrote:
> The attached patch imports the clean-tree command from bzrtools, as
> discussed a while back:
> 
> https://lists.ubuntu.com/archives/bazaar/2008q3/045532.html
> 
> It's not ready for inclusion yet; Aaron still owns the copyright, and
> that should be signed over to Canonical IIUC. Aaron, would you be ok
> with reassigning copyright? Does the rest of this patch look ok to you?

Here's a revised version that assigns copyright, makes the tests not
totally horrible on Windows, and fixes some whitespace issues.

BTW, in the future, please start by merging bzrtools (or whatever
project) into bzr, so that the annotations are preserved.

Aaron
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