RFC: streaming knit repository fetch interface

[Aaron Bentley]

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Robert Collins wrote:
> As part of Andrew's work on the smart server it would be great to beat
> the latency demon in the short term. The following sketch is for an
> interface to go on Repository to allow structured retrieval of all the
> data needed to perform a fetch, given that you know the revisions to be
> included.

Looks fine to me.

Aaron
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