Werk #11: Introduce optional lower limit for predicted levels

When configuring predictive levels while using relative levels or those based on the standard deviation then time periods with a very low reference (e.g. a CPU load below 1) would result in very narrow levels and lead to frequent false alarms.

Now you can set a lower limit for the levels, for example such that they would never go below 5 and 10 for warn and crit - regardless of the current predicted value.

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