Concept definition

template<typename EvaluatorType>
concept mgis::function::T2toST2EvaluatorConcept = 
      (T2toST21DEvaluatorConcept<EvaluatorType>) ||
      (T2toST22DEvaluatorConcept<EvaluatorType>) ||
      (T2toST23DEvaluatorConcept<EvaluatorType>)