Large re-write/enhancement. In pg-101 Jolly only included a smaller part

Large re-write/enhancement. In pg-101 Jolly only included a smaller part
of my (proff) patch. This is the rest of it, with a few, mainly aesthetic
changes. I've removed a lot of redundency from the original code,
added support for the new PQprint() routines in libpq, expanded tables,
and a few generally nifty ways of massaging data in and out of the
backend. Still needs some good stress testing.