turns on the instruction label.  will remove later
will undo later
Create a high-pass filter for accelerometer data, by subtracting the
very long term trend in values (gravity).

Also, submit one in five accelerometer samples--a moving average with a
timestamp of the middle sample
Revert my latest changes
Support 20Hz sampling, but only submit data points if change is
significant
Correct typo which caused accelerometer enabling to be changed on the
IOIO config page