[MERGE] Add an InventoryEntry cache for xml deserialization

[Vincent Ladeuil]

Vincent Ladeuil has voted approve.
Status is now: Approved


For details, see: 
http://bundlebuggy.aaronbentley.com/project/bzr/request/%3C49433B3E.8010002%40arbash-meinel.com%3E
Project: Bazaar