[MERGE] Deprecate last-revision and pending_merges.

[Aaron Bentley]

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Robert Collins wrote:
> This deprecates last_revision and pending_merges from the WorkingTree
> interface in favour of get_parent_ids.

Don't we want to keep last_revision as a convenience method?  I notice
several places where the elimination of last_revision has made the code
longer.  last_revision makes it easier to write correct code, rather
than calling "get_parent_ids()[0]" without a try block.

Aaron
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