message: Adding another way of getting the centrality for run1
diff: @@ -516,12 +516,27 @@ void AliAnalysisTaskEffContBF::UserExec(Option_t *) {
  AliCentrality *centrality = headerAOD->GetCentralityP();
  nCentrality =centrality->GetCentralityPercentile(fCentralityEstimator.Data());
  + if (nCentrality!=-1){
  +
  if(!centrality->IsEventInCentralityClass(fCentralityPercentileMin,
  fCentralityPercentileMax,
  fCentralityEstimator.Data()))
  return;
  }
  + else if (nCentrality==-1){
  +
  + AliMultSelection *multSelection = (AliMultSelection*) fAOD->FindListObject("MultSelection");
  + if(!multSelection) {
  + AliWarning("AliMultSelection object not found!");
  + }
  +
  + nCentrality = multSelection->GetMultiplicityPercentile(fCentralityEstimator, kFALSE);
  + if ((nCentrality < fCentralityPercentileMin) || (nCentrality >= fCentralityPercentileMax)) return;
  + }
  +
  + }
  +
  else {
  AliMultSelection *multSelection = (AliMultSelection*) fAOD->FindListObject("MultSelection");
  if(!multSelection) {
  