* Moved RoundedDoubleConverter from Core.Common.Gui/Converters to Core.Common.Base/TypeConverters. * RoundedDouble has TypeConverter defined to prevent having to declare all properties in property-window with RoundedDoubleConverter. * Extended RoundedDouble with '-' operator. * Changes IDistribution.Mean from double to RoundedDouble. Related to Issue [WTI-388] git-svn-id: https://repos.deltares.nl/repos/WettelijkToetsInstrumentarium/trunk@2515 5a3db67b-de53-47b5-99c8-a1c30a6650e2