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Adding c*L offset to stopped particle decays

Zach Marshall requested to merge zmarshal/athena:21.0_StoppedSimTests into 21.0

When we say in stopped particle land that a particle decays at 10 ns, we don't really mean 10ns after the bunch crossing, but at 10ns plus the distance to the IP times the speed of light after the bunch crossing (ie out of time by 10 ns). This MR adds an option (default to true) to include this offset in the decay time.

I believe this makes good sense, but it will be discussed shortly in a meeting to ensure that others agree with me.

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