message: PWGGA/GammaConv: More monitoring and fix in event selection
  Separate histograms for event quality (v0 reader) and
  event cuts (task)
  Reject also events with non-0 event quality
diff: @@ -124,8 +124,10 @@ void AliAnalysisTaskK0toPi0Pi0::UserCreateOutputObjects(){
  // Event counter histograms
  - fHistos->CreateTH1("hEventQualityBefore", "Event Quality (0 = good)", 13, -0.5, 12.5);
  - fHistos->CreateTH1("hEventQualityAfter", "Event Quality (0 = good)", 13, -0.5, 12.5);
  + fHistos->CreateTH1("hEventQualityBefore", "V0 reader Event Quality (0 = good)", 13, -0.5, 12.5);
  + fHistos->CreateTH1("hEventQualityAfter", "V0 reader Event Quality (0 = good)", 13, -0.5, 12.5);
  + fHistos->CreateTH1("hEventSelectionStatusBefore", "Event selection status (0 = good)", 14, -0.5, 13.5);
  + fHistos->CreateTH1("hEventSelectionStatusAfter", "Event selection status (0 = good)", 14, -0.5, 13.5 );
  fHistos->CreateTH1("hVertexZ", "z-component of the primary vertex; z (cm); Number of events", 1000, -40., 40.);
  fHistos->CreateTH1("hCaloPhotonsBefore", "Number of Events", 13, -0.5, 12.5);
  fHistos->CreateTH1("hCaloPhotonsAfter", "Number of Events", 13, -0.5, 12.5);
  @@ -249,11 +251,13 @@ void AliAnalysisTaskK0toPi0Pi0::UserExec(Option_t *){
  // do event selection
  // Use the same event selection as for the v0 reader
  // Good events defined as events with event quality 0
  - Bool_t selectionStatus = fEventCuts->IsEventAcceptedByCut(fV0Reader->GetEventCuts(), fInputEvent, fMCEvent, false, false);
  - Int_t eventQuality = fEventCuts->GetEventQuality();
  + Int_t selectionStatus = fEventCuts->IsEventAcceptedByCut(fV0Reader->GetEventCuts(), fInputEvent, fMCEvent, false, false);
  + Int_t eventQuality = fV0Reader->GetEventCuts()->GetEventQuality();
  fHistos->FillTH1("hEventQualityBefore", eventQuality);
  - if(selectionStatus) return;
  + fHistos->FillTH1("hEventSelectionStatusBefore", selectionStatus);
  + if(selectionStatus || eventQuality) return;
  fHistos->FillTH1("hEventQualityAfter", eventQuality);
  + fHistos->FillTH1("hEventSelectionStatusAfter", selectionStatus);
  fHistos->FillTH1("hVertexZ", fInputEvent->GetPrimaryVertex()->GetZ());
  