Create a new GUC variable search_path to control the namespace search

path.  The default behavior if no per-user schemas are created is that
all users share a 'public' namespace, thus providing behavior backwards
compatible with 7.2 and earlier releases.  Probably the semantics and
default setting will need to be fine-tuned, but this is a start.

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

@@ -191,6 +191,7 @@
 #	Misc
 #
 #dynamic_library_path = '$libdir'
+#search_path = '$user,public'
 #australian_timezones = false
 #authentication_timeout = 60	# min 1, max 600
 #deadlock_timeout = 1000