psql and libpq fixes

libpq should be back to normal (printing and all). Sorry once again for
the mess.

The psql quoting issue should be fixed as well. As is usual for
hand-crafted parsers, there's probably something I overlooked, so feel
free to bring that to my attention. I haven't done anything about the
echo options yet, although I'm leaning towards "-a".

While we're at it, there's a setting that causes psql to stop execution of
a script on an error (since usually the later commands will be depending
on the successful completion of earlier ones). I was wondering if that
should be the default if you use the -f option.

-- 
Peter Eisentraut                  Sernanders väg 10:115
peter_e@gmx.net                   75262 Uppsala
http://yi.org/peter-e/            Sweden