Helper functions for PMT to photon production process matching

[tgrbrooks]

Added to shared library so can be used in root macros.

Example macro:

void pmtMatchTest()
{

  // Create an event reader from the input file
  RAT::DSReader reader("../../ratmacros/test.root"); // path to your rat-pac files

  // Loop through the events
  int num_events = reader.GetT()->GetEntries();
  std::cout<<"Number of events = "<<num_events<<"\n";
  for(int i = 0; i < 10/*num_events*/; i++){

    RAT::DS::Root *event = reader.NextEvent();

    // Get the monte-carlo information
    RAT::DS::MC *mc = event->GetMC();
    for(int j = 0; j < mc->GetMCPMTCount(); j++){
      RAT::DS::MCPMT *pmt = mc->GetMCPMT(j);
      std::cout<<"MCPMT "<<j<<" ProcessFromEnergy = "<<RAT::ProcessFromEnergy(pmt)<<" ProcessFromNHit = "<<RAT::ProcessFromNHit(pmt)<<"\n";
    }   
    for(int j = 0; j < event->GetEVCount(); j++){
      RAT::DS::EV* trig = event->GetEV(j);
      for(int k = 0; k < event->GetEV(j)->GetPMTCount(); k++){                                                                                                
        RAT::DS::PMT *pmt = event->GetEV(j)->GetPMT(k);
        std::cout<<"PMT "<<k<<" ProcessFromEnergy = "<<RAT::ProcessFromEnergy(pmt, event)<<" ProcessFromNHit = "<<RAT::ProcessFromNHit(pmt, event)<<"\n";
      }   
    }   

  }

}