more modifications to the system scripts

The data collection script needs to be modified to run between 6:00 AM and 6:00 PM.

The script that writes the header has been modified to skip if the header has been written already for a given day.

Sensor scripts need to be written.
Sensor data collection/storage, and condtion determination contingencies scripts are needed.
Cloudy days, overcast days, and changes in season.
Cross-validation with calculations will be simple.