message: Added AliLightCascade class
diff: #pragma link C++ class AliLightV0+;
  #pragma link C++ class AliLightGenV0+;
  #pragma link C++ class AliLightV0track+;
  +#pragma link C++ class AliLightCascade+;
  #pragma link C++ class AliAnalysisTaskEbyeCharge+;
  