- finish ability to perform analog_read, analog_write, digital_read, digital_write during the 'environmental' measurement (before or after spectroscopy).
 - analog_write works - in "environmental", write:  ["analog_read",<location 0/1>,<PWM pin #>,<PWM setting>,<PWM Frequency>,<Time to hold PWM in ms>]
 - Now you can enter the main level number (like 1000+, 1015+ etc.) immediately followed by additional information successfully
 - example - to enter calibration data you can enter 1019+5.432+6.54+-1+
 - Next step is to allow chrome app to auto-push information to the device.

Signed-off-by:  <Greg>