Accelerating push via bzr:// and friends

[Aaron Bentley]

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Andrew Bennetts wrote:
> Initial tests suggest that bzr.dev has regressed a bit since 1.4!

I noticed that on Friday.  A lot of these get_parent_map calls are being
done for heads, and John's recently done a lot of work to make heads
more thorough and accurate, so that may be the cause.

Aaron
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