We really should have a mechanism to react to comet-timeouts, both render() (initial rendering of the comet-component), and ajax-requests going to the actor.

I propose to add 2 methods to LiftCometActor (naming similar to the configuration-variables for timeouts):

  def cometProcessingTimeoutHandler(): JsCmd = Noop
  def cometRenderTimeoutHandler(): Box[NodeSeq] = Empty