* Introduced VariationCoefficientDistributionPropertiesBase as base class for distribution properties that have CoefficientOfVariation properties instead of StandardDeviation. ** Split CoefficientOfVariation related responsibilities from DistributionPropertiesBase to VariationCoefficientDistributionPropertiesBase. * Moved description responsibilities from base classes to concrete classes. * Moved 'presence of IObservable' checking to constructor, away from properties. * Implemented use of VariationCoefficientNormalDistribution and VariationCoefficientLogNormalDistribution and related ObjectProperties classes. Related to Issue [WTI-631] git-svn-id: https://repos.deltares.nl/repos/WettelijkToetsInstrumentarium/trunk@5756 5a3db67b-de53-47b5-99c8-a1c30a6650e2