Getter ReleasePattern

[sbatka]

          this getter should change. 

input is the identity tuple (with amountype, ...)
the body of the method does:

1. checks if RawVariable contains such a pattern, if yes return
2. if not, checks if SingleDataNodeParameter has a pattern, if yes return it at the monthly basis
3. if not, log error: MissingPattern for goc "X"

This getter should be used in MonthlyAmortizationFactorCashflow instead of
private double[] NominalCuCashflow => GetScope((Identity with {AocType = AocTypes.CL}, (string)null, AmountTypes.CU, (int?)null)).Values;

Originally posted by @dcolleoni in #304 (comment)