[hm] Constrain min/max fan speed, lcd backlight to 0-100
[hm] If one thermsitor analogRead is more than 64 off the average, reject the whole period.

This helps to fix the one read you get when plugging in or unplugging a
probe, in the case you're plugging right in the middle of a sample. Also
helps for high impedance inputs like a thermocouple with a 1M input filter.