[Psycopg] Updated patch to quote delimiter and null characters in copy_* functions

[Alejandro Dubrovsky]

Refer to my previous email for rational.

This patch enlarges the default size of the copy buffer and also checks
to see if the copy query got truncated.  ie copy_to(somefile, '(some
long query)') is very handy and I went crazy with it until I broke the
first patch.


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