Fixed error with upgrade

ErrorTable would not upgrade properly. It was always comparing the same value. Not a pressing issue since the table has not changed, however it could have been an issue in the future.
Added feature Keep Screen On

Added option to keep the screen on while on the main status page. The default behavior is to NOT keep the screen on. The screen only stays on while on the main status page. All other pages will dim the screen as normal.
closes_maxima #41
Updated version and changelog