remove --all from bzr uncommit

[Aaron Bentley]

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Robert Collins wrote:
| +1 if you add a global TODO of 'Allow uncommit to remove unused data in
| 'branch-is-repository' situations'.

Or possibly 'Allow uncommit to remove unused data', period.  We are
requiring repository branches to be inside their repositories, so we can
know definitively which revisions are unreferenced.

Aaron
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