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.
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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.