Code cleanup

Added more precision to the unit low and high black window margins. Switched to PID routine from Pid without a PhD. The PID compute routine is now in the one second loop. The switch delay times are now in seconds, 0..720.

PID changes and algorithm tuning.

Added Kp, Kd and Ki settings to the units. Bumped to version 0.2.9

Fixed logging of old pid error again

Fixed logging of old pid error

PID old error was not set to the previous value but was always zero.

Updated to add support for lights in a fermenter unit and a Power Supply status.

Better tab switching with a cookie

Added cookies to remember tabs

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