message: simulation parameter is modifiable
diff: /// \param year : int, year, check in case of data set by hand for MC
  /// \param print : bool to print recovered parameters
  ///
  -void GetAlienGlobalProductionVariables(Bool_t simulation,
  +void GetAlienGlobalProductionVariables(Bool_t & simulation,
  TString & col, TString & period, Int_t & year,
  Bool_t print = kFALSE)
  {
  