new file kind reporting

[Aaron Bentley]

Robert Collins wrote:
> _iter_changes is
> defined as giving None as the kind for the unversioned side, when
> reporting newly versioned or unversioned paths. So this test is testing
> input data to the reporter that is not valid.

I never intended to define it that way, though the current
implementation may well be deficient.

> Any objection to this being removed?

Yes.

Aaron