[MERGE][0.16] Improvements to "bzr log file"

[Aaron Bentley]

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John Arbash Meinel wrote:
> The attached patch brings in Kent Gibson's changes to "bzr log file" to
> provide correct behavior for merged revisions, and to improve
> performance dramatically when dealing with large revision ranges.
> 
> This fixes a couple long-standing bugs.
> 
> The new function is moderately well tested, so I'm happy enough with it.
> 
> I'd really like to see this merged for 0.16, so if we can get a review,
> I'll be happy to do a quick turnaround to address any comments.

I'm sorry, but I can't accept this.  It introduces no new test cases and
the documentation is completely lacking.  I will give it points for
brevity, though. :-)

Aaron
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