Follow up on particle PV pointer, offline PV unbiasing example

Wouter Hulsbergenrequested to merge
sevda-v2PV-packing into master

To go with LHCb!4299 (merged), Rec!3665 (merged), Moore!2658 (merged)

Example of PV unbiasing, using PV constraints in DTF.

Closing Moore#608 (closed)

Edited by Sevda Esen

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