/**
  * constructor read config-file and initializes the vars
  *
  * @param   string  config-file-location
  * 
  * @access  public
  *
  * @author  patrick.kracht
  */
 public function __construct($config_file = "./configs/template.conf.php")
 {
     if (file_exists($config_file)) {
         // import settings for connection
         include $config_file;
         self::$tpl_folder = $tpl_folder;
     }
     self::$debugoff = isset($tpl_compress) ? $tpl_compress : true;
 }