[MERGE] Improve tests for the behaviour of Tree.iter_changes for missing paths that are only present in one tree, and fix found bugs. (Robert Collins)

[John Arbash Meinel]

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Robert Collins wrote:
> This makes the behaviour of missing files that are only in one tree
> consistent for all our InterTree implementations.
> 
> -Rob
> 
> 

BB:tweak

I agree with Andrew about raising TestNotApplicable, even though it
isn't your preference, it *is* the recommended way of doing it in the
test suite.

John
=:->
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