Subject: [HACKERS] Small date patches (resubmitted)

Here a some small patches for the date/time code. They set the default
output format for the datetime type to the traditional Postgres
style, and fix a date debugging declaration. I submitted these
a couple of days ago, but they might have gotten lost...


NOTE: the second patch to dt.c is what I believe D'Arcy submitted as well,
      that I claimed was taken out...sorry D'Arcy, my fault :(