Persistence extensions, calculate QuantityType sums in absolute values#4575

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mherwege wants to merge 3 commits intoopenhab:mainfrom mherwege:persistence_sum

+85-56

Commits on Jan 23, 2025

make persistence sum calculations absolute
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Commits on Jan 24, 2025

correct units for variance and deviation quantity type calculations
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Commits on Jan 25, 2025

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