Now passing the transpose tests as well.  yz transpose in loop over x.

This is a very low performance, first-pass solution.  Both of the
loops over transposes should be coalesced, but its good to have
something working.

The Poisson kernel, when enabled, isn't producing a converging solution.
Its not clear to me if that's an issue with Poisson or with how it is
being hooked into cggo.