added meta viewport for a better default page size on mobile devices

main.php

@@ -18,6 +18,7 @@ $showTools = !tpl_getConf('hideTools') || ( tpl_getConf('hideTools') && $_SERVER
     <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
     <title><?php tpl_pagetitle() ?> [<?php echo strip_tags($conf['title']) ?>]</title>
     <?php tpl_metaheaders() ?>
+    <meta name="viewport" content="width=device-width,initial-scale=1" />
     <link rel="shortcut icon" href="<?php echo _tpl_getFavicon() /* DW versions > 2010-11-12 can use the core function tpl_getFavicon() */ ?>" />
     <?php _tpl_include('meta.html') ?>
 </head>