- make some improvements to dekstop sharing by

  1. Convert the initial image that is sent to the server as grayscale
  2. Add some debug logs on the applet to determine which step is taking
     a long time. As suspected, it is on the network, esp. using http.
  3. Fix a bug in the server side. Turns out we are not incrementing the
     timestamps in constant interval like we do with the voice. Not doing so,
     doesn't allow the Flash Player to drop frames when packets arrive late.