Add definitions for calibration help, and accelerometer filters
New accelerometer configuration controls
When setting the selection of spinners, add 2nd argument=true, to make
the widget show that value on screen
Restore accelerometer configuration details
Major update to add filtering, compensation for the angle of the phone
mount
Major update to to acclerometer handling: add filtering, compensation
for the angle of the phone mount
Declare preferences for the new accelerometer parameters.