[PATCH] Cache support for branch and pull

[Aaron Bentley]

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Hi all,

I've implemented cache support for branch and pull.  This means that
they will only download revisions and inventories once, and can take
full advantage of parallel or pipelined download to prevent latency from
slowing down downloads.

For the command bzr branch -r 100 http://bazaar-ng.org/bzr/bzr.dev

Before:
real    4m43.335s
user    0m3.710s
sys     0m0.560s

After:
real    2m55.654s
user    0m4.450s
sys     0m0.700s

And if you add async(see earlier posting), you get:
real    2m6.679s
user    0m4.440s
sys     0m0.590s

I've introduced a CachedStore wrapper, and a find_cached_branch that
substitutes a CachedStore for all the stores in a RemoteBranch.
CachedStore also introduces the "prefetch" method, which allows multiple
ids to be added to the cache before they're needed.  update_revision now
uses "prefetch" if it's available.

Note that this cache is temporary, not a permanent, centralized cache.
Centralized caching would be easy to add, though.

I've attached the changes as one big patch, or you can go
revision-by-revision with
http://panoramicfeedback.com/opensource/bzr.precache/

Aaron
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