Add switches for DELIMITER and NULL in pg_dump COPY

Folks,

>From the earlier discussion, it appears that there is a variety of
opinions on what the COPY delimiter should be in pg_dump.  This patch
allows people to set it and the NULL string.  Thanks to Gavin Sherry
for help with the pointers :)

I didn't patch pg_dumpall, but it would be trivial if there's a use
case.

Cheers,
D
--
David Fetter david@fetter.org http://fetter.org/
phone: +1 415 235 3778

Remember to vote!