* Changed the linktest web page to allow for killing a running
  linktest when called from the showexp page. Puts up a simple Click
  form, whose action is to call "linktest_control -k" which does the
  dirty work.

* Implement a simple frameset when running linktest. I did this cause
  it was something new and besides, it was more fun then trying to
  reverse engineer the modelnet model file. Anyway, when linktest is
  started, put up a new window that has a two window frameset. The
  right hand window is just the spew output from linktest as it runs
  (although with buffering not much turns up at first). The left side
  window has a single click box to stop the running linktest, whose
  action is to call linktest_control -k as above. By the magic of
  javascript, when the linktest finishes, the stop button is removed
  and replaced with a "Linktest Finished" message. So exciting.