Changed db pool config to keep handles open forever rather than a billion
seconds. A billion seconds from mid-May 2006 is 2038, so folks were
running into the Unix Y2.038K bug a few decades early. That billion number
was originally picked because 0 (keep open forever) didn't work in earlier
versions of AOLserver. Early versions of the Oracle client interface on
Linux used to hang when the handle was closed, thus the need to keep them
open "forever". Turns out it's a good idea anyway if the db library and
the appropriate db driver for AOLserver don't leak memory. Both PG and
Oracle have been well-behaved in this respect, so we just keep the db handles
open indefinitely by default.
