[MERGE] Add __eq__ and __ne__ methods to Repository objects

[Andrew Bennetts]

Martin Pool wrote:
[...]
> 
> I think in this case explicit is better: I would rather have a method called eg
> 
>   repo.isSameLocation(other)
> 
> that gives some indication of what's being compared, and that makes it
> clear this is not just an ==.  That's not a great name for it though.

Yeah, it's hard thinking of a good name.  The precise concept is really "is
stored at the same URL", which is a bit verbose to squeeze into a method name.
I think isSameLocation (or a variation on the phrase "same location", e.g.
at_same_location_as?) is about as good as we'll get :/

-Andrew.