Use md5sum files if available

            if ( empty($path) ) $path = $this->filePath;

            // Pretty much faster if it is available

            if ( $this->commandExists( 'md5sum' ) ) {

            if ( file_exists( $path . ".md5sum" ) ) {

                $tmp = explode("  ", file_get_contents( $path . '.md5sum' ));

                $ret = $tmp[0];

            }

            elseif ( $this->commandExists( 'md5sum' ) ) {

                $tmp = explode("  ", exec( 'md5sum ' . $path));

                $ret = $tmp[0];

            } else {