[MERGE] Reorganize TreeTransform inventory delta creation

[Aaron Bentley]

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Hi all,

This patch refactors portions of TreeTransform._apply_removals and
TreeTransform._apply_insertions into a new
TreeTransform._generate_inventory_delta method.  This has a negligible
effect on performance (on MySQL trees) and code size.  The point is
simply to get cleaner code.

Some of the benefits are cleaner signatures for _apply_removals and
_apply_insertions.  The other major benefit is separation of concerns;
TT._generate_inventory_delta only does delta generation, while
TT._apply_insertions and TT._apply_removals handle the filesystem side.

Aaron
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