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Draft: Add isolation selections to fullscan PFOs

Jon Burr requested to merge jburr/athena:hlt-pfo-iso into master

This adds isolation selections to the fullscan PFOs. These selections are taken from similar selections in the MET Associator and designed to prevent muons being constructed as PFOs. In order to avoid repeating the extrapolation I had to teach the CaloIsolationTool how to use the CaloExtensionCache and rewrite the PFHLTSequence to include an algorithm creating this cache.

These selections are off by default so this doesn't change any trigger counts. In order to enable it the new flag Trigger.jetMET.UsePFOIso needs to be set to true. This can be done via pre-exec.

Tagging @khoo, @jbossios and @bcarlson for info.

Marking as draft for now as there are a few other studies I want to do with these selections first, but having this here gives others a chance to look it over.

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