Arduino dynamic power, & better cmd recognition

Arduino can now be turned on and off (via the labjack) purely from the
CommandModule (specifically, setting DAC0 pin to 5.0V or 0.0V).  Arduino
gets it's power from a 9v battery at the moment, but hopefully soon my
9V, 1.5A power supply will arrive to give it a permanent switchable
power source.

Also, I upgraded the command recognition of the arduino.  Now the
arduino will recognize known commands and pulse a green LED when it
receives a good command, and if it gets something it doesn't recognize,
it will turn on a permanent red LED.