postgresql.conf server_min_messages

I now realize that server_min_messages should have been
log_min_messages. The log_* grouping was done after I added
server_min_messages and I didn't see the similarity. Also,
show_parser_stats, etc. should be log_parser_stats because the output
goes to the log and not to the user's terminal.

I may clean that up in 7.4. Too late for 7.3.

-- 
  Bruce Momjian                        |  http://candle.pha.pa.us
  pgman@candle.pha.pa.us               |  (610) 359-1001
  +  If your life is a hard drive,     |  13 Roberts Road
  +  Christ can be your backup.        |  Newtown Square, Pennsylvania 19073