Update on commit refactoring work

[Aaron Bentley]

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Ian Clatworthy wrote:
> Right now, my main one is around deprecating _read_tree_state and
> _forget_tree_state in inventory.py.  These are used in change_entry()
> inside transform.py (which isn't used anywhere in the core?). Any ideas
> on whether than function can be deprecated or removed?

read_tree_state is used in inventory.py.  So you'd have to remove it
there too.

change_entry is obsolete.  It was used in revert, and certainly could be
deprecated.

Aaron
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