$wgGroupPermissions['sysop']['suppressredirect'] = true;
#$wgGroupPermissions['sysop']['pagelang'] = true;
#$wgGroupPermissions['sysop']['upload_by_url'] = true;
-#$wgGroupPermissions['sysop']['mergehistory'] = true;
+$wgGroupPermissions['sysop']['mergehistory'] = true;
// Permission to change users' group assignments
$wgGroupPermissions['bureaucrat']['userrights'] = true;