Some trivial patch

A couple of improvements. I can compile without the wx/regex.h header on
Ubuntu 14.04, and also the WXK_SPACE works.

I still haven't fully grasped how the completion works. If you use the
psql command tool, completion happens at more places than what is
offered by pgadmin, e.g., join. I found the utils/tabcomplete.c file.
--
Med Venlig Hilsen / Kind regards,
Mads Jensen

Max Jerry Horovitz: "Unfortunately, in America, babies are not found in
cola cans. I asked my mother when I was four and she said they came from
eggs laid by rabbis. If you aren't Jewish, they're laid by Catholic
nuns. If you're an atheist, they're laid by dirty, lonely prostitutes."
-- Mary and Max (2009)