This patch updates the regression tests to allow "make installcheck" to
pass if "default_with_oids" is set to false. I took the approach of
explicitly adding WITH OIDS to the CREATE TABLEs where necessary, rather
than tweaking the default_with_oids GUC var.
Barring any objections, I intend to apply this to HEAD and REL8_0_STABLE
today or tomorrow.
-Neil
