Re: Autoconf upgrade

> I plan to upgrade to Autoconf 2.53 in the next couple of days.  If anyone
> has configure changes pending or other objections, speak now.

I'm working on the integer timestamp issue, which seems to have an
autoconf component. I was hoping for feedback on the question of setting
HAVE_LONG_INT_64, HAVE_LONG_LONG_INT_64, and INT64_IS_BUSTED, how that
relates to USE_INTEGER_DATETIMES, and how much of this to push into
autoconf. istm that most of it needs to be in autoconf so that we get
these defined consistantly.
                  - Thomas