Add new G4FastCaloTest simulator configuration
G4FastCaloTest
is the same as G4FastCalo
except that
charged pions below 200 MeV and protons, KLong and K+- below 750 MeV
entering the Calorimeter are handled by Geant4.
This will be used to check the (physics and CPU) performance impact of using Geant4 to simulate these lower energy particles.