message: const member function fix
diff: @@ -405,7 +405,7 @@ public:
  void PrintWarnings() { print_level = true; }
  // Return the value of the global relative data oscillation
  - double GetOsc() { return global_osc; }
  + double GetOsc() const { return global_osc; }
  // Return the local relative data oscillation errors
  const Vector & GetLocalOscs() const
  