[brisbane-core/MERGE] inventory fix & refactor

[ian.clatworthy at internode.on.net]

The attached patch fixes CHKInventory._get_mutable_inventory()
and refactors CHKInventory_create_by_apply_delta() so that
an apply_delta() method can be added real soon now.

Altogether, there are currently 15 public methods on Inventory
that CHKInventory doesn't support. Adding apply_delta() will
reduce that number by one and make it easy to add others
that I need (e.g. add, __del__, rename) for fastimport to work
on formats using CHKInventories. Yes, I know that fastimport
will need tweaking to be efficent on new formats but I want
it working first.

As I'm partly offline currently and can't commit to the branch,
can I please ask the reviewer to merge this?

Thanks,
Ian C.
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