[CHK/MERGE] Use chk map to determine file texts to fetch

[Andrew Bennetts]

Andrew Bennetts wrote:
> Hi Robert,
> 
> This patch improves chk->chk fetch to compare hash values rather than
> inventory entries when determining the text versions to transfer.  Fetching is
> still very slow for other reasons, but this seems like a step in the right
> direction.

This update adds CHKMap.copy_to(store) and uses it to make fetch run in a
reasonable amount of time.

-Andrew.

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