add return 0 to atom_vec

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

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

  virtual int pack_comm_bonus(int, int *, double *) {}

  virtual int pack_comm_bonus(int, int *, double *) {return 0;}

  virtual void unpack_comm_bonus(int, int, double *) {}

  virtual int pack_reverse(int, int, double *);

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

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

  virtual int pack_border_bonus(int, int *, double *) {}

  virtual int unpack_border_bonus(int, int, double *) {}

  virtual int pack_border_bonus(int, int *, double *) {return 0;}

  virtual int unpack_border_bonus(int, int, double *) {return 0;}

  virtual int pack_exchange(int, double *);

  virtual int unpack_exchange(double *);

  virtual int pack_exchange_bonus(int, double *) {}

  virtual int unpack_exchange_bonus(int, double *) {}

  virtual int pack_exchange_bonus(int, double *) {return 0;}

  virtual int unpack_exchange_bonus(int, double *) {return 0;}

  virtual int size_restart();

  virtual int pack_restart(int, double *);

  virtual void unpack_restart_init(int) {}

  virtual int size_restart_bonus() {}

  virtual int pack_restart_bonus(int, double *) {}

  virtual int unpack_restart_bonus(int, double *) {}

  virtual int pack_restart_bonus(int, double *) {return 0;}

  virtual int unpack_restart_bonus(int, double *) {return 0;}

  virtual void create_atom(int, double *);

  virtual void create_atom_post(int) {}