missing header for 404 status in the following pages

[stan-bg]

In Google Webmaster Tools i found large amounts of duplicate title tags, the reason for which was pages that existed, but they doesn't anymore(category pages,product pages and manufacturer pages).
Googlebot still indexed this pages with dublicate content(the content generated in not_found.tpl on category,product and manufacturer page),maybe because response header is with http status 200(OK).

The header with 404 status need to be added in category,product,manufacturer and information controller page:

//..
else {
//...

$this->response->addHeader($this->request->server['SERVER_PROTOCOL'] . '/1.1 404 Not Found');

   if (file_exists(DIR_TEMPLATE . $this->config->get('config_template') . '/template/error/not_found.tpl')) {
        $this->template = $this->config->get('config_template') . '/template/error/not_found.tpl';
   } else {
        $this->template = 'default/template/error/not_found.tpl';
   }


}
//..

P.S. Sorry for my bad english.

[danielkerr]

fixed in the next commit.