message: Add error propagation in histo rebin
diff: @@ -2319,11 +2319,14 @@ TH1D* AliVertexingHFUtils::RebinHisto(TH1* hOrig, Int_t reb, Int_t firstUse){
  Int_t lastSummed=firstBinOrig-1;
  for(Int_t iBin=1;iBin<=nBinFinal; iBin++){
  Float_t sum=0.;
  + Float_t sume2=0.;
  for(Int_t iOrigBin=0;iOrigBin<reb;iOrigBin++){
  sum+=hOrig->GetBinContent(lastSummed+1);
  + sume2+=(hOrig->GetBinError(lastSummed+1)*hOrig->GetBinError(lastSummed+1));
  lastSummed++;
  }
  hRebin->SetBinContent(iBin,sum);
  + hRebin->SetBinError(iBin,TMath::Sqrt(sume2));
  }
  return hRebin;
  }
  