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Update ATLFAST3F_G4MS configuration

John Derek Chapman requested to merge jchapman/athena:UseG4inCaloATLFAST3F_main into master

After discussions with experts we determined that it would be best to only use Fatras for Inner Detector simulation, so this merge request updates the ATLFAST3F_G4MS configuration to use Geant4 rather than Fatras to simulate particles in the Calorimeter which are not passed to FastCaloSim/FastCaloGAN (mainly this effects muons and long-lived exotic particles).

The configuration of ATLFAST3F_G4MS should now match the ATLFAST3 simulator configuration, except for the simulator used in the Beam Pipe and Inner Detector, where Fatras rather than Geant4 is used in ATLFAST3F_G4MS.

Tagging @lmijovic, @pagacova.

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