[MERGE] loosen the constraints on WorkingTree.set_last_revision.

[John Arbash Meinel]

...

> IOW, the first_parent of the working tree was in fact an inaccessible
> ghost revision.

I'm still a little concerned that it shouldn't be a different API, so
that it doesn't happen by accident. But I'm not that concerned. So +1
from me.

John
=:->


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