[MERGE] optimize annotate

[Wouter van Heyst]

On Tue, Nov 28, 2006 at 05:05:35PM -0500, Aaron Bentley wrote:
> Hi all,
> 
> This patch speeds up annotate by retrieving all relevent revisions at once.
> 
> Before:
> 
> $ time bzr annotate builtins.py > /dev/null
> 
> real    0m3.556s
> user    0m2.700s
> sys     0m0.300s
> 
> After:
> 
> $ time bzr annotate builtins.py > /dev/null
> real    0m1.491s
> user    0m1.400s
> sys     0m0.050s

Even though the sizable amount of annotations is listified first.
I have trouble seeing when that would become a problem, as so often with
these kind of tradeoffs. 

Given the speed improvement (and otherwise correct code) you have my +1,
I wouldn't mind learning to see how the cost equation works though :)

Wouter van Heyst
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