[MERGE] Deprecate last-revision and pending_merges.

[Aaron Bentley]

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Robert Collins wrote:
> basis_revision might be nice, but I'd want it to throw if there is no
> left most parent - to avoid this inconsistency where we consider there
> to be an implicit tree sometimes and not others. (Thats another thing I
> dislike about last_revision).

The way I see it, last_revision is consistent, but when the
last_revision is the null revision, different bits of the code behave in
different ways.  If it returned 'empty:' or 'null:' instead, you'd still
get that.

Aaron
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