<commit_before>LorenzLab -- Notes for Lab #4 -- Animation

This lab adds rudimentary animation along with  controls to start and stop it.

* Controller<commit_msg>a little more detail in the notes<commit_after>LorenzLab -- Notes for Lab #4 -- Animation

This lab adds rudimentary animation. Data points are created on a separate
thread. The UI has buttons to start and stop it. New class is:

* Controller: UI widgets, and the logic behind them, to start and stop the
  generation of points; to reset (i.e., discard all points) and to generate
  one point at a time.  
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