WIP: First approach to adding nTrack dependence in PGPrimaryVertex

Laurent Dufourrequested to merge
pgprimaryvertex-ntracks-dependence into master

This is a most simple implementation to add a scaling with nTracks to the PGPrimaryVertex tool. Has to be tested still, hence WIP. @adavis

Details in LHCBGAUSS-2181

Edited by Gloria Corti

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