print analog outputs of battery voltages
add calibrated battery readouts and improve analog printing
figure out baud rate and millis() and delay() factors
make printAnalogs() and die() for printing data and turning off
make getBatteryVoltages() calculate voltage of each cell
make debugMode allow for careful battery coefficient calibration when nonzero
careful battery coefficient calibration, with out FTDI 5v interference
shut off if any of the three batteries gets too low voltage
turn off after less time holding the button down
various printing improvements