[PATCH] RevisionSpec can be instantiated from another RevisionSpec

[John A Meinel]

In several places in the code, something tries to lookup a RevisionSpec
from another RevisionSpec object. The attached patch makes it so that
this just returns a new object of the same type as the original.

It also adds an equality test for 2 RevisionSpec objects, and some tests
to make sure things work correctly. (It took me a while to realize that
the return value of __new__() is used to call the __init__ with the
original parameters, not the ones that you supply, so you have to have
both __new__ and __init__ handle the new case).

This patch can be found on my integration branch (revno 1216).

John
=:->
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