Add tests of EvtGen.
Added 3 options files to check that EvtGen is not changing significantly. All 3 options have 1M events and as they use particle gun, they take about 10 min each. To run these, Gauss MR 595 is needed.
Added 3 options files to check that EvtGen is not changing significantly. All 3 options have 1M events and as they use particle gun, they take about 10 min each. To run these, Gauss MR 595 is needed.