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

[John Arbash Meinel]

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Robert Collins wrote:
| 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
|

I personally approve for 1.4, but would like to understand what you think a
reasonable approach is for bzr.dev and 1.5.

John
=:->

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