RFC: difference in dirstate iter_changes and inventory iter_changes

[Robert Collins]

There is a slight difference between the two iter_changes
implementations.

Specifically, the inventory based one includes missing files, whereas
the dirstate one is skipping them. We have a test about this, but I
think its wrong :)

tree.add('foo')
os.unlink('foo')
len(tree.iter_changes(tree.basis_tree()))
-> 1 for inventory based iter_changes
-> 0 for dirstate

any objection to my making these consistently 1 ? 

-Rob

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