[MERGE] Deprecate tree.find_renames

[Aaron Bentley]

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Hi all,

Ever heard of the "renames" command?  Or tree.find_renames?  They were
introduced in the prehistoric days of revision 164, and haven't changed
much since then.  I just ran across find_renames today.

find_renames is a poor API nowadays, because it takes two inventories as
its input.  But more unfortunately, it considers a file renamed if its
parent directory is renamed.  So "bzr status" is a much better indicator
of which files have actually been renamed.

I've started by deprecating find_renames, because inventory-based APIs
are bad.  I've implemented cmd_renames in terms of iter_changes.

I'm also inclined to hide the "renames" command.  Any objections?

Aaron
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