selecting large result sets in psql using cursors

Hi there,

attached is the new and fixed version of the patch for selecting
large result sets from psql using cursors.

It was previously discussed on hackers:
http://archives.postgresql.org/pgsql-hackers/2006-07/msg00231.php

Thanks again to Neil Conway for helping with this (the first
sketch of the patch was his :)

Wondering if this makes a chance to get accepted...

Bye :-)
Chris.