[MERGE] New method ``iter_inventories`` on Repository

[Robert Collins]

This moves the inventory iteration from the revision_trees() method to
an iter_inventories, and replaces get_inventory's logic with a trivial
call to iter_inventories reducing code duplication.

This is useful when implementing inventory types that cannot be
deserialised from a single document - avoiding double-round-tripping
(native -> xml -> deserialised)

-Rob
-- 
GPG key available at: <http://www.robertcollins.net/keys.txt>.
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