format strings wherever possible.  Remarkably, this exercise didn't
turn up any inconsistencies, but it seems a good idea for the future.

'aggname (aggtype)'.  The old syntax 'aggname aggtype' is still accepted
for backwards compatibility.  Fix pg_dump, which was actually broken for
most cases of user-defined aggregates.  Clean up error messages associated
with these commands.

datatype in test, to try to avoid any dependency on local time zone.

psql's \d option work properly.

In particular, mark all I/O functions that can produce or consume
a date as noncachable, in light of existence of DateStyle variable.

-infinity and +infinity.  Put TIMESTAMP_NOT_FINITE guard into the routine,
instead of forgetting it at some call sites.  Fixes regression test
failures here.

 time zones.
SQL99 spec requires a default of zero (round to seconds) which is set
 in gram.y as typmod is set in the parse tree. We *could* change to a
 default of either 6 (for internal compatibility with previous versions)
 or 2 (for external compatibility with previous versions).
Evaluate entries in pg_proc wrt the iscachable attribute for timestamp and
 other date/time types. Try to recognize cases where side effects like the
 current time zone setting may have an effect on results to decide whether
 something is cachable or not.

build on systems without.

definition without changing the function's OID, thereby not breaking
rules, views, triggers, etc that depend on it.  From Gavin Sherry.

Updated URLs.

deleted it.

of coping by reducing shared_buffers/max_connections settings.