Added new package dataIO and moved class PersistenceUtilities there
Added abstract class element
Added abstract class element and derived class NAND2
Changed some try blocks in PersistenceUtilities to try-with-resources and got rid of the finally blocks
Created Enum ElemntBaseClass and Interface ITestable
Created Enum ElemntBaseClass and Interface ITestable
Created nested enums to ElementBaseClass to group element types, Added classes AndOrTypeElement, AndTypeElement, OrTypeElement, OutputTypeElement, NotTyprElement
Created nested enums to ElementBaseClass to group element types, Added classes AndOrTypeElement, AndTypeElement, OrTypeElement, OutputTypeElement, NotTyprElement