message: Make new method for cross section loading default
  Switch to new method to load cross section and
  number of trials from pythia file to default. Old method
  will be kept as fallback for a couple of weeks in case
  of problems observed in transition period.
diff: @@ -135,7 +135,7 @@ AliAnalysisTaskEmcal::AliAnalysisTaskEmcal() :
  fMCRejectFilter(kFALSE),
  fCountDownscaleCorrectedEvents(kFALSE),
  fUseBuiltinEventSelection(kFALSE),
  - fReadPyxsecFast(false),
  + fReadPyxsecFast(true),
  fPtHardAndJetPtFactor(0.),
  fPtHardAndClusterPtFactor(0.),
  fPtHardAndTrackPtFactor(0.),
  @@ -259,7 +259,7 @@ AliAnalysisTaskEmcal::AliAnalysisTaskEmcal(const char *name, Bool_t histo) :
  fMCRejectFilter(kFALSE),
  fCountDownscaleCorrectedEvents(kFALSE),
  fUseBuiltinEventSelection(kFALSE),
  - fReadPyxsecFast(false),
  + fReadPyxsecFast(true),
  fPtHardAndJetPtFactor(0.),
  fPtHardAndClusterPtFactor(0.),
  fPtHardAndTrackPtFactor(0.),
  