Backend support for autocommit removed, per recent discussions. The

only remnant of this failed experiment is that the server will take
SET AUTOCOMMIT TO ON.  Still TODO: provide some client-side autocommit
logic in libpq.

contrib/rtree_gist/bench/bench.pl

@@ -32,13 +32,6 @@ my $setsql = qq{
 my $sth = $dbi->prepare($setsql);
 $sth->execute();
 
-my $setsql2 = qq{
-    SET autocommit TO 'on';
-};
-
-my $sth2 = $dbi->prepare($setsql2);
-$sth2->execute();
-
 my $sql;
 my $notice;
 my $sss = '(3000,3000,2990,2990)';

contrib/rtree_gist/rtree_gist.sql.in

@@ -1,8 +1,6 @@
 -- Adjust this setting to control where the objects get created.
 SET search_path = public;
 
-SET autocommit TO 'on';
-
 --
 --
 --