Switching the base class for the Relationship class.

It was previously using the GRATR::Edge class, which
had wonky overrides that dramatically slowed down
sorting (its hash mechanism hashed the source and
target so that edges with the same source/target got
the same hash, which we actually don't want any more).

This shouldn't change any functionality, just performance.

I didn't retain all functionality from the Edge class, but
a lot of that functionality was, um, horrible, like Edge[]
being equivalent to Edge.new.

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