pair_kim : private to protected and add virtual to all routines

      virtual void unpack_reverse_comm(int, int*, double*);

      virtual double memory_usage();

   private:

   protected:

      // (nearly) all bool flags are not initialized in constructor, but set

      // explicitly in the indicated function.  All other data members are

      // initialized in constructor

      // values set in coeff()

      // values set in allocate(), called by coeff()

      void allocate();

      virtual void allocate();

      int* lmps_map_species_to_unique;

      // values set in coeff(), after calling allocate()

      // KIM specific helper functions

      virtual void set_contributing();

      void kim_init();

      void kim_free();

      void set_argument_pointers();

      void set_lmps_flags();

      void set_kim_model_has_flags();

      virtual void kim_init();

      virtual void kim_free();

      virtual void set_argument_pointers();

      virtual void set_lmps_flags();

      virtual void set_kim_model_has_flags();

      // static methods used as callbacks from KIM

      static int get_neigh(

         void const * const dataObject,