Adding PbPb ProbNN weights structure
Modification of protoparticles.py code to include PbPb ProbNN weights. The PbPb files are selected via a new option in the make_charged_protoparticles function called collisiontype. For upstream, electrons and ghosts, the weights will be the pp ones.
This MR is linked to the weights in the MR: lhcb-datapkg/ParamFiles!165 (merged)
Edited by Imanol Corredoira