switch off all decays in Epos

Currently we force all particles that Epos produces but that are unknown to C8 to decay inside Epos. Since version 8.3xx, pythia (the backend for the default decay process in C8) knows how to handle many many more resonances and their decays. When the interface to pythia 8.3xx is merged (!427 (merged)) we can switch all decays in Epos off (add ::epos::othe2_.idecay = 0; // switch off epos internal decays to epos::initialize) and add them to C8 (copy entries from ParticleData.xml in Pythai 8.3xx to src/framework/core/ParticleData.xml).

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