Where are the comparison operators for graphs implemented?  I can find
``__eq__`` in graphs/generic_graph.py, but I can't find any others.

I haven't opened a ticket yet for the following behavior because I am
not sure where the problem is.

The current status is some new math!  At the moment, I see the
following.  (The following sometimes works, sometimes needs fiddling
with order of creation or which graphs get a vertex.)

sage: g1 = Graph()
sage: g1.add_vertex(0)
sage: g2 = Graph()
sage: g3 = Graph()
sage: g3.add_vertex(0)
sage: g1 == g3
True
sage: g1 == g2
False
sage: g1 < g2
False
sage: g3 < g2
True

So we have two equal graphs that compare on either side of a third
graph!

Thanks!

- Ryan

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