[development] AHAH documentation and a patch to Poll module

Hi All, I know many people have been frustrated by the lack of proper documentation on the correct way to do ahah forms, in particular writing an ahah callback, and am pleased to announce that there are now two handbook pages on the subject on drupal.org. Please see http://drupal.org/node/348475 for an introduction to ahah in Drupal, and its subpage, http://drupal.org/node/331941, for specific documentation on writing an ahah callback. Also, a significant patch to poll.module was recently committed which makes it adhere to Form API best practices. See http://drupal.org/node/331708. This reinstates poll.module as the best place to go to learn Drupal AHAH forms by example :-) regards, Katherine