[MERGE] Support fetching a restricted set of revisions

[Aaron Bentley]

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Jelmer Vernooij wrote:
> The attached bundle adds a parameter to InterRepository.fetch() to
> retrieve a limited set of revisions from the source repository and adds
> an implementation for retrieving a limited set to KnitRepository1. This
> is a step towards shallow branches.

Wouldn't it be more efficient (e.g. with the smart server) to specify
the history horizon revision, rather than the particular revisions to fetch?

Aaron
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