Comments should not use GROUP BY on a blob

There is a random, uneccessary "GROUP BY" clause added to the original comment query. But, there are no aggregation functions (COUNT,MAX,MIN,etc.) on the main query. Removes and fixes a couple quries that do that. Below is an example of the problematic query. Notice the GROUP BY added at the end.

$query = 'SELECT c.cid, c.pid, c.nid, c.subject, c.comment, c.format, c.timestamp, c.name, c.mail, c.homepage, u.uid, u.name AS registered_name, u.picture, u.data, c.score, c.users, c.status FROM {comments} c INNER JOIN {users} u ON c.uid = u.uid WHERE c.cid = %d';
      $query_args = array($cid);
      if (!user_access('administer comments')) {
        $query .= ' AND c.status = %d';
        $query_args[] = COMMENT_PUBLISHED;
      }
      $query .= ' GROUP BY c.cid, c.pid, c.nid, c.subject, c.comment, c.format, c.timestamp, c.name, c.mail, u.picture, c.homepage, u.uid, u.name, u.picture, u.data, c.score, c.users, c.status';