[MERGE] Test case for commit of deleted entries

[Robert Collins]

Currently the behaviour of commit deleting entries from the working tree
when the disk paths are missing is untested : no test
matching .*test_commit.* fails when the code to do that is disabled or
broken.

This patch adds a test that it works, updating the tree memory inventory
and the inventory on disk is correctly updated.

This is the prep work for me fixing the unneeded inventory parsing
during commit caused by the current layer interactions.

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