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perform VPClustering inside MCLinking sequence using full VPCluster

Renato Quagliani requested to merge rquaglia-masterFixMCLinks into master

In this MR, i introduce back a VPClusFull algorithm which does the equivalent of the "Offline" Velo clustering [it also sort the hits by phi] and produce the Offsets as we do for tracking purpose in TDR branch.

I also modify the linking sequence to run instead of VPCluster2MCParticleLinker the new VPFullCluster2MCParticleLinker and inside PrLHCbID2MCParticle i try first to get if exist the vector<VPFullCluster>, if it fails it tries to read vector<VPLightCluster> to produce the link of All LHCbID to MCParticle.

I checked running the pixel tracking not event storing in TES the VPLightClusters and i get the same tracking efficiencies of not having this patch applied.

This should fix 1 of the elements which prevents to merge TDR to master later on. MR linked to LHCb!1396 (merged) and Lbcom!263 (merged) FYI: @cattanem , @sneubert , @sstahl , @sponce , @gligorov, @gdujany , @fpolci , @adudziak , @chasse , @graven

Edited by Marco Cattaneo

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