* Introduced PipingCalculationGroup, to allow the user to define piping calculation groups. ** Introduced IPipingCalculationItem as element type for PipingFailureMechanism.Calculations in order to have that collection contain both PipingCalculation and PipingCalculationFolder instances. *** Implemented extension methods to recursively retrieve all PipingCalculation instances when dealing with IPipingCalculationItem. Related to Issue [
WTI-174]
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