Can we call method of base class directly?

[DominikRafacz]

In some of the operations, we have to override the base class method ELEM_OUT operator(ELEM_IN), even though it looks exactly the same as in the base class. Furthermore, when we want to use the base class method initilaize_element_out we have to specify superclass (e.g. OperationSqToSq<INTERNAL_IN, INTERNAL_OUT>::initialize_element_out(sequence_in) in complement.h even though it is not overridden.