[MERGE/RFC] Branch.dotted_revno_to_revision_id()

[Ian Clatworthy]

Ian Clatworthy wrote:
> This patch proposes a new API for Branch called
> dotted_revno_to_revision_id(). The dotted-revno
> => revision-id lookup in revisionspec.py has been
> refactored to use this new method.

Here's an updated version that provides the reverse API
as well, choosing the optimal algorithm for getting to
the result.

Ian C.
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