message: add non constant binning for multiplicity vs centrality histogram
diff: #include <TH1F.h>
  //#include <TObjectTable.h>
  #include <TGeoGlobalMagField.h>
  +#include <TCustomBinning.h>
  //---- AliRoot system ----
  #include "AliAnalysisManager.h"
  @@ -585,7 +586,28 @@ TList *AliAnaCaloTrackCorrMaker::GetOutputContainer()
  fhCentrality0Tracks->SetXTitle("Centrality bin");
  fOutputContainer->Add(fhCentrality0Tracks) ;
  - fhCentralityTrackMult = new TH2F("hCentralityTrackMult","Number of events in centrality bin", 100, 0., 100, 100, 0, 100) ;
  + TCustomBinning cenBinning;
  + cenBinning.SetMinimum(0.0);
  + cenBinning.AddStep(100, 5);
  + TArrayD cenBinsArray;
  + cenBinning.CreateBinEdges(cenBinsArray);
  +
  + TCustomBinning multBinning;
  + multBinning.SetMinimum(0);
  + multBinning.AddStep(50,1);
  + multBinning.AddStep(100,2);
  + multBinning.AddStep(200,5);
  + multBinning.AddStep(400,10);
  + multBinning.AddStep(1000,20);
  + multBinning.AddStep(2000,50);
  + TArrayD multBinsArray;
  + multBinning.CreateBinEdges(multBinsArray);
  +
  + fhCentralityTrackMult = new TH2F
  + ("hCentralityTrackMult","Number of events in centrality bin",
  + cenBinsArray .GetSize() - 1, cenBinsArray .GetArray(),
  + multBinsArray.GetSize() - 1, multBinsArray.GetArray()
  + ) ;
  fhCentralityTrackMult->SetXTitle("Centrality bin");
  fhCentralityTrackMult->SetYTitle("Track multiplicity");
  fOutputContainer->Add(fhCentralityTrackMult) ;
  