message: Increase ClassDef.
  See
diff: @@ -111,6 +111,6 @@ private:
  AliGenParam(const AliGenParam &Param);
  AliGenParam & operator=(const AliGenParam & rhs);
  - ClassDef(AliGenParam, 4) // Generator using parameterised pt- and y-distribution
  + ClassDef(AliGenParam, 5) // Generator using parameterised pt- and y-distribution
  };
  #endif
  