New pg_dump patch, --no-stats flag, disables sending to statistics collector

This patch adds another flag to pg_dump, this time to disable statistics 
collection.  This is useful if your don't want pg_dump activity to show 
(or clutter) your normal statistics.  This may be appropriate for an 
organization that regularly dumps a database for backup purposes, but 
wants to analyze only the application's database use.

This is patched against CVS HEAD from today, though the code is quite 
version independent.  This patch is unsolicited, and as far as I know 
has not been discussed on the list prior to now.

Comments?