[MERGE] lazy inventory writes

[Robert Collins]

WorkingTree currently writes the inventory on nearly every mutation
operation. This patch adds the facility for us to write it only on
unlock, and updates set_root_id to use this. This combined with a minor
change to tree initialisation gives us only one inventory write to disk
during tree creation.

Soon to follow, something about lazy inventory reading.

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