Eliminate quickly alternating Helios decisions

[dostuffthatmatters]

On critical sun conditions (right at the threshold between good and bad), the Helios decision will change frequently. This puts more load on the hardware than necessary and should be avoided.

Idea: Have two thresholds. A big one - e.g. 0.01 - above which the decision should change to true, and a small one - e.g. 0.007 - below the current decision should switch to false. The user defined threshold is the big one. The small threshold is a fixed x percent of the big one. In between those thresholds, the decision will stay the same, i.e. start if value rises above 0.01, stop if value sinks below 0.007, continue as is otherwise.