Invalid new comment flag

Comment module uses users node last access to determine if comments are new. If in a content type whe have talk module enabled this is not valid.

I've made this patch to resolve this issue. There is no example in the code I provide to show how to count the number of new comments in a node, so I put it here.

function mytheme_preprocess_node(&$vars) {
  $node = $vars['node'];
  $vars['new_comments'] = comment_num_new($node->nid, talk_get_last_access($node->nid));
}

P.D. Related issue: #506670: Module removes "X new comments" link in node links