support.js: some enhancements and new functions

+ ajax_http_get(url,callback) now checks the HTTP response status and shows an
  error message if the status is not OK (is not 200)
+ New function node(tag,attrs,children) to create document nodes with arbitraty
  attributes and children. The functions node() and text() should now be enough
  to construct arbitrary document trees in an easy, functional way, and many of
  the more specialized functions could be removed.
+ When calling the function button(label,action,key), the action can be a
  function instead of a string, so you can use local/anonymous functions.
+ New function debug(str) adds text to the element with id=debug, if it
  exists.

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