fix for yes/no dialog probs; gutter cleanups

the evil yes/no infinite loop should finally be gone. i also bowdlerized the supposedly insulting text i put in before, and implemented a new callback scheme for widgets. the :callback-ex keyword specifies a function or form that is passed two arguments, the image instance that was clicked on or otherwise invoked, and the corresponding event (for the moment, a misc-user event that invokes the callback). this obviates the need for the horrid widget-callback-current-channel. finally, i fixed a typo (boundp instead of fboundp) introduced in a recent patch. -- Ben In order to save my hands, I am cutting back on my mail. I also write as succinctly as possible -- please don't be offended. If you send me mail, you _will_ get a response, but please be patient, especially for XEmacs-related mail. If you need an immediate response and it is not apparent in your message, please say so. Thanks for your understanding. See also http://www.666.com/ben/typing.html.