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Allowing masses and decays to be added to a param card

Zach Marshall requested to merge zmarshal/athena:21.6_MassExceptionInMGC into 21.6

Under some circumstances, particles that are available or known to Pythia might need to be added to a MG param card (for example a gravitino). This patch allows such situations, though with a warning to let the user know that the particle isn't in the default param card.

Should help with a request from @kpachal

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