[MERGE] apply_inventory_delta

[Aaron Bentley]

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Hi all,

This patch implements MutableTree.apply_inventory_delta, which should
replace the need for WorkingTree._write_inventory.  It was based on my
knowledge of TreeTransform's needs and Robert's knowledge of dirstate's
needs.

I say "should" advisedly-- as it turns out, smart_add_tree() has
different requirements.  If its "save" parameter is False, then the
working tree inventory is modified, but not written to disk.

This seems like a pretty bad idea to me.  It ties us to the inventory
representation that we want to move away from.  Can we do something
about it?

Simply deprecating the "save" parameter won't work, because the "save"
parameter is also used for doing dry runs.  So it seems like the best
option is to deprecate "save", and replace it with "save_inventory" or
something similar, which would leave the inventory in a pristine state
after a dry run.

I've tried disabling this functionality, and it seems like none of bzr
itself requires it.

Aaron
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