message: update AddTask for MC
  change mass binning in MC.
diff: @@ -123,10 +123,12 @@ AliAnalysisTaskElectronEfficiencyV2* AddTask_dsekihat_ElectronEfficiencyV2_PbPb(
  task->SetPhiBinsLinear (0, TMath::TwoPi(), 36);
  task->SetThetaBinsLinear(0, TMath::TwoPi(), 60);
  - const Int_t Nmee = 150;
  + const Int_t Nmee = 197;
  Double_t mee[Nmee] = {};
  for(Int_t i=0 ;i<110; i++) mee[i] = 0.01 * (i- 0) + 0.0;//from 0 to 1.1 GeV/c2, every 0.01 GeV/c2
  - for(Int_t i=110;i<Nmee;i++) mee[i] = 0.1 * (i-110) + 1.1;//from 1.1 to 5 GeV/c2, evety 0.1 GeV/c2
  + for(Int_t i=110;i<126; i++) mee[i] = 0.1 * (i-110) + 1.1;//from 1.1 to 2.7 GeV/c2, every 0.1 GeV/c2
  + for(Int_t i=126;i<176; i++) mee[i] = 0.01 * (i-126) + 2.7;//from 2.7 to 3.2 GeV/c2, every 0.01 GeV/c2 for J/psi
  + for(Int_t i=176;i<Nmee;i++) mee[i] = 0.1 * (i-176) + 3.2;//from 3.2 to 5 GeV/c2, every 0.1 GeV/c2
  std::vector<double> v_mee(mee,std::end(mee));
  const Int_t NpTee = 146;
  