* summary.c: summary screen is now updated using ajax instead of refreshing

  the whole page.  Not only does this look cleaner, but it also has the
  happy side effect of not reloading all of the images.
* webcit.c: new API calls begin_ajax_response() and end_ajax_response() for
  wrapping inner div's
* webcit.c: removed the "refresh30" parameter from output_headers() and
  from all code that calls it.  We don't need it anymore; refreshing the
  entire page is, like, sooooo 2004.  :)