Removed the low pass filter (commented out), reverted to using the mean
of the spread around the gaze

Added a median calculation around the spread, and graphed that value.
- Will test using this instead of the mean.
- Discovered more problems on Windows XP.
- A lot of noise in my joystick. May switch to using a generic function
generator
- Will switch to a nine point calibration to compare accuracy and
precision compared to 5 points.
Added the ability to disable the mouse control, separate of the the
keyboard.
Added better messages