[MERGE/1.4 only] Back out transaction cache removal.

[Robert Collins]

This should be merged to 1.4 but not to mainline, and if 1.4 were merged
to mainline, cherry picked out from the merge so it doesn't apply.

It reinstates the transaction cache which caused the performance hit
with knits, while I expected some fallout too much has occured and we
shouldn't need to delay the release to track them all down.

-Rob
-- 
GPG key available at: <http://www.robertcollins.net/keys.txt>.
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