Logic fixes, 100W buffers, Fix for Tier priority

1.0.80

Add 100W buffer, don't stop loads unless headroom more than -100Watts

Add Main device override to stop less important tiers if more important tier now out of cooldown and able to run.
(this issue was upsetting impression of events below)

1.0.77
Better Fix for Tiers starting and stopping

1.0.75
Fix tiers priority not always being followed

1.0.70
Move catchup to its own window period checked at the end and then runs

Fine tuning multiple day windows
Catchup also is over the runtime window period - so no catchup unless in the final phase / last day of the window periodd