[MERGE] [BUG #4663] Fix ``bzr log -r`` to support selecting merge revisions.

[Aaron Bentley]

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Kent Gibson wrote:
> The attached bundle fixes filtering of revisions based on revisionspec.
> `bzr log -rA` and `bzr log -rA..B` now work for all supported
> revisionspecs.
> That includes other log options such as <file>.

Could someone else review this please?

Aaron
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