Add multiple taxonomy filters to edit.php that support search

Figured this out by using this code:

function override_is_tax_on_post_search($query) {
        global $pagenow;
        $qv = &$query->query_vars;
        if ($pagenow == 'edit.php' && isset($qv['taxonomy']) && isset($qv['s'])) {
            $query->is_tax = true;
        }
    }
}
add_filter('parse_query','override_is_tax_on_post_search');