Commit to match discussed elog() changes. Only update is that LOG is

now just below FATAL in server_min_messages.  Added more text to
highlight ordering difference between it and client_min_messages.

---------------------------------------------------------------------------

REALLYFATAL => PANIC
STOP => PANIC
New INFO level the prints to client by default
New LOG level the prints to server log by default
Cause VACUUM information to print only to the client
NOTICE => INFO where purely information messages are sent
DEBUG => LOG for purely server status messages
DEBUG removed, kept as backward compatible
DEBUG5, DEBUG4, DEBUG3, DEBUG2, DEBUG1 added
DebugLvl removed in favor of new DEBUG[1-5] symbols
New server_min_messages GUC parameter with values:
        DEBUG[5-1], INFO, NOTICE, ERROR, LOG, FATAL, PANIC
New client_min_messages GUC parameter with values:
        DEBUG[5-1], LOG, INFO, NOTICE, ERROR, FATAL, PANIC
Server startup now logged with LOG instead of DEBUG
Remove debug_level GUC parameter
elog() numbers now start at 10
Add test to print error message if older elog() values are passed to elog()
Bootstrap mode now has a -d that requires an argument, like postmaster

src/backend/utils/misc/postgresql.conf.sample

@@ -108,8 +108,15 @@
 
 
 #
-#	Debug display
+#	Message display
 #
+
+#server_min_messages = log	# Values, in order of decreasing detail:
+				#   debug5, debug4, debug3, debug2, debug1,
+				#   info, notice, error, log, fatal, panic
+#client_min_messages = info	# Values, in order of decreasing detail:
+				#   debug5, debug4, debug3, debug2, debug1,
+				#   log, info, notice, error
 #silent_mode = false
 
 #log_connections = false