[MERGE] Use a LRUCache in LocalTransport.clone

[Robert Collins]

On Sat, 2008-01-05 at 01:41 +1100, Andrew Bennetts wrote:
> This is a simple change to use a LRUCache in LocalTransport.clone.  It seems
> that calculating an abspath can be quite expensive.  By keeping the LRUCache I
> reduce the time to pull a 300 revisions from a knit repo into a pack repo from
> ~32 seconds to ~26 seconds!

Thats nice, but why do we care? We're trying to migrate to packs and
conversions should be one-offs. It should not be any slower than knit to
knit cloning anyhow.

If clone() is slow and affecting our recommended formats, lets fix that.
But lets not add complexity because it is affecting our legacy formats.

bb:reject

-Rob

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