message: Travis error.
diff: @@ -89,9 +89,8 @@ public:
  private:
  int maxp; //maximum value of the power p
  - double newton_abs_tol;
  - double newton_rel_tol;
  - int newton_iter;
  + const int newton_iter;
  + const double newton_rel_tol, newton_abs_tol;
  };
  class NormalizedGradCoefficient : public VectorCoefficient
  