The ValueHandler interface now extends NewInstantiable.
Now only the store module throws ValueHandler events.
Now the ValueHandler modules use the copy constructor correctly.
Modifier methods removed from the interface are now on the basic
implementation.
Moved the ValueHandler event handling to AbstractValueHandler.
Added a method to extend the setParent method without modifying the
existing operation.
Implemented the equals and hashcode methods on DelegateValueHandler.
Renamed DiceGroup to Dice.
ContrastInterval now returns ContrastIntervals.