Updated VeloSim and VeloRadDamage to use new 2nd metal model (optionally) if requested by SIMCOND

Merged David Hutchcroft requested to merge dhcroft-NewVeloSim into master

This code by itself should not change the Velo output. It allows new parameters which scale the 2nd metal effect with a new (better) model and makes the cluster size closer to the data in the MC. For details see the presentations in the T&A/Simulation meeting: https://indico.cern.ch/event/693499/

Edited by Marco Cattaneo

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