message: add doxygen def group for pi0 energy calibration
diff: * + scanTemp.C
  *
  */
  +
  +/**
  + * \defgroup EMCALOfflineMacrosCalibPi0 EMCALOfflineMacrosCalibPi0
  + * \ingroup EMCALOfflineMacros EMCALOfflineMacros
  + * \brief Macros for EMCal energy calibration with Pi0
  + */
  +
  