message: Update fem/gridfunc.hpp
diff: @@ -465,8 +465,7 @@ public:
  double ComputeDGFaceJumpError(Coefficient *exsol,
  Coefficient *ell_coeff,
  double Nu,
  - const IntegrationRule *irs[] = NULL)
  - const;
  + const IntegrationRule *irs[] = NULL) const;
  /** This method is kept for backward compatibility.
  