ERROR/ABORT message

I have changed the WARN messages to ERROR and ABORT messages.

I wanted to differentiate between errors the user caused, and are
normal, like mistyped field names, and more serious errors coming from
the backend routines.

I have made all the elog's in the parser/ directory as ERRORS. All the
others are ABORT.

Does someone want to review all the elog's and submit a patch changing
ABORT to ERROR as appropriate?

--
Bruce Momjian
maillist@candle.pha.pa.us