Fill the ENNReal action on finitely additive measures - #702
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Scalar multiplication is pointwise, so the module laws follow from those of EReal.
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Summary
DistribMulActionfor scalar multiplication of finitely additive measures: zero, additivity, unit, and associativity reduce to the corresponding identities onEReal.Test plan
lake build Analysis.MeasureTheory.Section_1_4_3; CI covers the module.