[RFC] Ability to register optimised revision fetchers

[Jelmer Vernooij]

It would be nice if all of the fetchers in Bazaar (native and
non-native) supported prompting a set of hooks for a faster way to fetch
particular revisions. 

There are a couple of use cases for this:

 * A plugin that keeps a cache of all revisions in a store in ~
somewhere
 * A plugin that queries launchpad's vcs-imports when importing from a
foreign version control system
 * A plugin that asks other local servers whether they have a copy of a
revision

Cheers,

Jelmer
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