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Add PFSum variants with CS/VS SK subtraction

Jon Burr requested to merge jburr/athena:PFsumCSSK into master

As suggested by @khoo, we want to take a look at the basic PFSum algorithm using PFOs with constituent subtraction applied. The best subtraction method available is CSSK (constituent subtraction + soft killer) but this is somewhat slow so an implementation for VSSK (Voronoi + soft killer) is also included. This MR makes the following changes

  • JetRecoConfiguration.defineJetConstit is modified to allow Voronoi
  • The cluster and PFO configurations in METRecoSequences are modified to allow applying constituent modifiers (supplied by a new constitmod key in the SignatureDict)
  • New chains and associated containers are added to the menu and EDM

Tagging @bcarlson for info.

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