Code review for standard_conforming_strings patch. Fix it so it does not

throw warnings for 100%-SQL-standard constructs, clean up some minor
infelicities, try to un-break ecpg to the best of my ability.  (It's not clear
how ecpg is going to find out the setting of standard_conforming_strings,
though.)  I think pg_dump still needs work, too.

src/backend/utils/misc/guc.c

@@ -10,7 +10,7 @@
  * Written by Peter Eisentraut <peter_e@gmx.net>.
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.318 2006/05/02 11:28:55 teodor Exp $
+ *	  $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.319 2006/05/11 19:15:35 tgl Exp $
  *
  *--------------------------------------------------------------------
  */
@@ -46,6 +46,7 @@
 #include "optimizer/geqo.h"
 #include "optimizer/paths.h"
 #include "optimizer/planmain.h"
+#include "parser/gramparse.h"
 #include "parser/parse_expr.h"
 #include "parser/parse_relation.h"
 #include "parser/scansup.h"

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

@@ -279,7 +279,7 @@
 					#   warning
 					#   error
 					#   panic(off)
-				 
+
 #log_min_duration_statement = -1	# -1 is disabled, 0 logs all statements
 					# and their durations, in milliseconds.
 
@@ -415,8 +415,8 @@
 #add_missing_from = off
 #array_nulls = on
 #default_with_oids = off
-escape_string_warning = on		# warn about backslashes in string literals
-#standard_conforming_strings = off	# SQL standard string literal processing
+#escape_string_warning = on
+#standard_conforming_strings = off
 #regex_flavor = advanced		# advanced, extended, or basic
 #sql_inheritance = on