message: Adding class to LinkDef
diff: #pragma link C++ class AliAnalysisTaskChargedFlow+;
  #pragma link C++ class AliAnalysisTaskGFWFlow+;
  +#pragma link C++ class AliAnalysisTaskFlowExample+;
  #pragma link C++ class AliGFWCuts+;
  #pragma link C++ class AliGFWCumulant+;
  #pragma link C++ class AliGFW+;
  