Removed unnecessary explicit deleting of operator== in DistributedVector and DistributedVectorView

   using BaseType::DistributedArray;

   using BaseType::operator=;

   // comparison operator is defined in DistributedVectorExpressions

   template< typename ArrayT >

   bool operator == ( const ArrayT& a  ) = delete;

   // we return only the view so that the user cannot resize it

   LocalVectorViewType getLocalVectorView();

   using BaseType::DistributedArrayView;

   using BaseType::operator=;

   // comparison operator is defined in DistributedVectorExpressions

   template< typename ArrayViewT >

   bool operator == ( const ArrayViewT& a  ) = delete;

   // In C++14, default constructors cannot be inherited, although Clang

   // and GCC since version 7.0 inherit them.

   // https://stackoverflow.com/a/51854172