PrDebugTrackingLosses calculate radiation length fraction for MCParticle

Andre Guntherrequested to merge
gunther-rad-length into master

For electrons in particular, it can be interesting to study the amount of material traversed by them. This MR adds radiation length information to the particles studied by PrDebugTrackingLosses.

Goes with Moore!2857 (merged)

Edited by Andre Gunther

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