message: Remove return value to fix root 6 compilation
  Function was given a return type of float, but doesn't return a value.
  This changes to void.
diff: @@ -84,7 +84,7 @@ class AliAnalysisTaskEmcalJetShapesMC : public AliAnalysisTaskEmcalJet {
  void SetAngularWindowRecoilJet (Float_t t) {fangWindowRecoil = t; }
  Float_t GetMinPtTriggerSelection() {return fminpTTrig;}
  Float_t GetMaxPtTriggerSelection() {return fmaxpTTrig;}
  - Float_t SetMediumParameters(Float_t t, Float_t c) {fqhat=t; fxlength=c;}
  + void SetMediumParameters(Float_t t, Float_t c) {fqhat=t; fxlength=c;}
  void SetCentralitySelectionOn(Bool_t t) { fCentSelectOn = t;}
  void SetOneConstSelectionOn(Bool_t t) { fOneConstSelectOn =t;}
  void SetMinCentrality(Float_t t) { fCentMin = t ; }
  