- Patch #9884 by Bart Jansens:
  + The 'previous topic' / 'next topic' links skipped topic without comments (changed one inner join back to a left join).
  + The default order setting in admin/settings/forum had no effect.
  + The 'first new topic' link jumped to the first unread topic ever instead of the first unread topic since NODE_NEW_LIMIT.
  + This also removes the unused $offset param from theme_forum_display and theme_forum_topic_list, so any themes using these functions should be updated (i checked the core themes but none of them used these functions).