- Fixed bug 4710: comment module should use drupal_set_message() correctly.
- Fixed the title and breadcrumb trail of the comment delete page, added missing cache flush, improved usability and made it so that when you delete a comment replies are deleted as well. - Added 'delete comment' links to the comments on node pages. Hopefully this will make it easier to maintain old threads such as those attached to the book pages on drupal.org. - Comment module maintenance: added missing t() functions and improved consistency of the calls to drupal_set_message(), used radio buttons instead of a selection box.