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Tighten the requirement of particles subject to quasi-stable sim

Miha Muskinja requested to merge mmuskinj/athena:21.0-QSsim-status3 into 21.0

As discussed in:

We should change the

status != 3

requirement to

status < 3

to avoid pushing 'documentation' particles to quasi-stable simulation. One such example are photons with status 43, which have a vertex with zero-distance that just changes the status to 1. If they are subject to QS-simulation, the position of the vertex changes dramatically, because Geant4 does not handle particles with zero lifetime well.

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