[MERGE] Make pulling bundle 6x faster

[Aaron Bentley]

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Aaron Bentley wrote:
> Hi all,
> 
> This patch makes it 6x faster to pull a bundle, by
> 1. re-using the matching_blocks info from the multiparent deltas in the
>    bundle

> It is now possible to pull the first 1000 revisions of bzr from a bundle
> in 10 seconds.  This formerly took 64 seconds.

Here's a slight tweak to avoid sequence matching for un-annotated texts.
This brings it down to 9 seconds.

Aaron
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