Commit3 JT 092319

  virtual bigint memory_usage() {return 0;}

  void modify_params(int, char **);

  virtual int modify_param(int, char **) {return 0;}

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  double fnorm_sqr();

  double fnorm_inf();

  double fnorm_max();

  // methods for spin minimizers

  double max_torque(); 

  double total_torque();

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  virtual double fnorm_sqr();

  virtual double fnorm_inf();

>>>>>>> aa2b885783e471ed622e1402adeed67e3224aa53

  virtual void init_style() {}

  virtual void setup_style() = 0;