Added --titlebar option to enable/disable the titlebar

The titlebar scrambled var/log/Stdout.log and can becasue of this not be
on by default.

mysql-test/mysql-test-run.pl

@@ -365,7 +365,7 @@ my $opt_max_save_core= env_or_val(MTR_MAX_SAVE_CORE => 5);
 my $opt_max_save_datadir= env_or_val(MTR_MAX_SAVE_DATADIR => 20);
 my $opt_max_test_fail= env_or_val(MTR_MAX_TEST_FAIL => 10);
 my $opt_core_on_failure= 0;
-
+my $opt_titlebar= 0;
 my $opt_parallel= $ENV{MTR_PARALLEL} || 1;
 my $opt_port_group_size = $ENV{MTR_PORT_GROUP_SIZE} || 20;
 
@@ -908,7 +908,7 @@ sub run_test_server ($$$) {
 	  delete $next->{reserved};
 	}
 
-	titlebar_stat(scalar(@$tests)) if $set_titlebar;
+	titlebar_stat(scalar(@$tests)) if $set_titlebar && $opt_titlebar;
 
 	if ($next) {
 	  # We don't need this any more
@@ -1245,6 +1245,7 @@ sub command_line_setup {
              'start-and-exit'           => \$opt_start_exit,
              'start'                    => \$opt_start,
 	     'user-args'                => \$opt_user_args,
+             'titlebar'                 => \$opt_titlebar,
              'wait-all'                 => \$opt_wait_all,
 	     'print-testcases'          => \&collect_option,
 	     'repeat=i'                 => \$opt_repeat,
@@ -6502,6 +6503,8 @@ Misc options
                         leaves just the server running
   start-dirty           Only start the servers (without initialization) for
                         the first specified test case
+  titlebar              Enable progress stats on the windows title bar. Works
+                        on Windows and Xterm.
   user-args             In combination with start* and no test name, drops
                         arguments to mysqld except those specified with
                         --mysqld (if any)