message: Automatically enable background subtraction for PbPb
  In addition few info/debug streams
diff: @@ -155,6 +155,7 @@ void AliEmcalTriggerMakerKernel::ConfigureForPbPb2015()
  AddL1TriggerAlgorithm(64, 103, 1<<fTriggerBitConfig->GetGammaHighBit() | 1<<fTriggerBitConfig->GetGammaLowBit(), 2, 1);
  AddL1TriggerAlgorithm(0, 63, 1<<fTriggerBitConfig->GetJetHighBit() | 1<<fTriggerBitConfig->GetJetLowBit() | 1<<fTriggerBitConfig->GetBkgBit(), 8, 4);
  AddL1TriggerAlgorithm(64, 103, 1<<fTriggerBitConfig->GetJetHighBit() | 1<<fTriggerBitConfig->GetJetLowBit() | 1<<fTriggerBitConfig->GetBkgBit(), 8, 4);
  + fDoBackgroundSubtraction = true;
  fConfigured = true;
  }
  @@ -405,6 +406,7 @@ void AliEmcalTriggerMakerKernel::ReadTriggerData(AliVCaloTrigger *trigger){
  // Reading of the rho values (only PbPb)
  if(fDoBackgroundSubtraction) {
  + AliInfoStream() << "Reading median values: EMCAL " << fRhoValues[kIndRhoEMCAL] << ", DCAL " << fRhoValues[kIndRhoDCAL] << std::endl;
  fRhoValues[kIndRhoEMCAL] = trigger->GetMedian(0); // EMCAL STU at position 0
  fRhoValues[kIndRhoDCAL] = trigger->GetMedian(1); // DCAL STU at position 1
  }
  @@ -553,6 +555,7 @@ void AliEmcalTriggerMakerKernel::CreateTriggerPatches(const AliVEvent *inputeven
  if(fDoBackgroundSubtraction) {
  double area = TMath::Power(static_cast<double>(patchit->GetPatchSize())/4., 2);
  double rhoval = (patchit->GetRowStart() >= 64) ? fRhoValues[kIndRhoDCAL] : fRhoValues[kIndRhoEMCAL];
  + AliDebugStream(1) << "Subtracting background for area " << area << ": " << rhoval << " -> " << (area * rhoval) << std::endl;
  patchit->SetADC(patchit->GetADC() - area * rhoval);
  }
  // convert
  