class AliEMCALTrigger: public AliTriggerDetector

  Class for trigger analysis.
  Digits are grouped in TRU's  (Trigger Units). A TRU consists of 384
  modules ordered fNTRUPhi x fNTRUEta. The algorithm searches all possible 2x2
  and nxn (n is a multiple of 2) cell combinations per each TRU,  adding the
  digits amplitude and finding the maximum. If found, look if it is isolated.
  Maxima are transformed in ADC time samples. Each time bin is compared to the trigger
  threshold until it is larger and then, triggers are set. Thresholds need to be fixed.
  Thresholds need to be fixed. Last 2 modules are half size in Phi, I considered
  that the number of TRU is maintained for the last modules but decision not taken.
  If different, then this must be changed.
  Usage:

  //Inside the event loop
  AliEMCALTrigger *tr = new AliEMCALTrigger();//Init Trigger
  tr->SetL0Threshold(100); //Arbitrary threshold values
  tr->SetL1GammaLowPtThreshold(1000);
  tr->SetL1GammaMediumPtThreshold(10000);
  tr->SetL1GammaHighPtThreshold(20000);

  tr->Trigger(); //Execute Trigger
  tr->Print(""); //Print results

*-- Author: Gustavo Conesa & Yves Schutz (IFIC, CERN)