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(at)fetter(dot)org http://fetter.org/
phone: +1 415 235 3778

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