- fixed CO2 so now it's no longer off by a factor of 10
- updated light measurements so it shows the values in uE by default (using saved calibration data)
- added light meter calibration to add the slope and y intercept, saved to eeprom'
- added device info, now saved to EEPROM, which can be called by pressing '1' upon startup
- included time.h library to the 'additional libraries' folder

Signed-off-by:  <Greg>