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Update to tauRec PFlow jets support - adding shower subtracted clusters

Adam Bailey requested to merge adbailey/athena:tau_pflow_links into master

Update to support of PFlow jet seeds in taus. It is now possible to include shower subtracted clusters in eflow rec, this merge now adds this for taus. The function in HelperFunctions has been modified to return a list of clusters from the jet constituents. The shower subtracted clusters are accessed via the charged PFOs, and there is a check to ensure duplicate calo clusters are not added to the list.

This was discussed in: https://its.cern.ch/jira/browse/ATLTAU-1691

There is an option to enable including the subtracted clusters in tauRecFlags. This is enabled by default, but only does anything when running over PFlow jet seeds. For now we keep the default seed collection as LCTopo.

There is a slight change to the dR check in MvaTESVariableDecorator, it now uses the cluster object rather than the jetconstituent.

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