[MERGE] Inventory-free checkout

[Aaron Bentley]

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Hi all,

This patch allows checkout to avoid ever converting a dirstate into an
inventory.  This is an important step in our goal of eventually removing
Tree.inventory from the public API.

It is also a slight performance improvement:
Old (best of 4):
real    0m1.015s
user    0m0.744s
sys     0m0.268

New (best of 4):
real    0m0.999s
user    0m0.764s
sys     0m0.208s

Which is a piddly 1.01x as fast.

This patch adds two APIs to provide functionality we previously needed
Inventory for.

Tree.iter_all_ids
This lists all the file ids in the tree.  We need this for our
duplicate-id checks

Tree.stored_kind
This produces the file kind stored in the inventory or dirstate.  It's
needed to generate an Inventory Delta involving files that are missing.

It also adds a dirstate-native implementation of apply_inventory_delta.

Aaron
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