Made CalculationInputPropertyChangeHandler independent of Calculation and ICalculation, but rather of an IObservable. Other specific information is contained in the CalculationInputPropertyChangeHandler implementation. Related to Issue [WTI-1128] git-svn-id: https://repos.deltares.nl/repos/WettelijkToetsInstrumentarium/trunk@8390 5a3db67b-de53-47b5-99c8-a1c30a6650e2