message: EMCal Embed: Fix jet constituent index
  AliEmcalJet::Track(i) calls AliEmcalJet::TrackAt(i), so calling
  AliEmcalJet::Track(AliEmcalJet::TrackAt(i)) is redundant and
  causes an index out of bounds. This occurred here a few times
  since the calls to the two functions were separated.
diff: @@ -1543,7 +1543,7 @@ void AliJetResponseMaker::GetMCLabelMatchingLevel(AliEmcalJet *jet1, AliEmcalJet
  d1 -= track->Pt();
  if (!track2Found) {
  - AliVParticle *MCpart = jet2->Track(index2);
  + AliVParticle *MCpart = jet2->Track(iTrack2);
  AliDebug(3,Form("Track %d (pT = %f, eta = %f, phi = %f) is associated with the MC particle %d (pT = %f, eta = %f, phi = %f)!",
  iTrack,track->Pt(),track->Eta(),track->Phi(),MClabel,MCpart->Pt(),MCpart->Eta(),MCpart->Phi()));
  d2 -= MCpart->Pt();
  @@ -1584,7 +1584,7 @@ void AliJetResponseMaker::GetMCLabelMatchingLevel(AliEmcalJet *jet1, AliEmcalJet
  d1 -= part.Pt() * cellFrac;
  if (!track2Found) { // only if it is not already found among charged tracks (charged particles are most likely already found)
  - AliVParticle *MCpart = jet2->Track(index2);
  + AliVParticle *MCpart = jet2->Track(iTrack2);
  AliDebug(3,Form("Cell %d belonging to cluster %d (pT = %f, eta = %f, phi = %f) is associated with the MC particle %d (pT = %f, eta = %f, phi = %f)!",
  iCell,iClus,part.Pt(),part.Eta(),part.Phi_0_2pi(),MClabel,MCpart->Pt(),MCpart->Eta(),MCpart->Phi()));
  d2 -= MCpart->Pt() * cellFrac;
  @@ -1622,7 +1622,7 @@ void AliJetResponseMaker::GetMCLabelMatchingLevel(AliEmcalJet *jet1, AliEmcalJet
  d1 -= part.Pt();
  if (!track2Found) { // only if it is not already found among charged tracks (charged particles are most likely already found)
  - AliVParticle *MCpart = jet2->Track(index2);
  + AliVParticle *MCpart = jet2->Track(iTrack2);
  AliDebug(3,Form("Cluster %d (pT = %f, eta = %f, phi = %f) is associated with the MC particle %d (pT = %f, eta = %f, phi = %f)!",
  iClus,part.Pt(),part.Eta(),part.Phi_0_2pi(),MClabel,MCpart->Pt(),MCpart->Eta(),MCpart->Phi()));
  