add FILTER_BEAM to cut away events only recording beam particles

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gemc.jlab.org

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add FILTER_BEAM to cut away events only recording beam particles #205

Open zhaozhiwen opened 3 years ago

zhaozhiwen commented 3 years ago

this is to help reduce output size and increase speed when testing Geant4 physics by shooting beam particles into a target and recording all hits in the target