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Increase track selection flexibility in DL2

Dan Guest requested to merge dguest/athena:dl2-remap into master

This adds some flexibility how b-tagging handles tracks:

  • Adds an algorithm to copy track links from jets to the b-tagging object.
  • Make the DL2 (i.e. DIPS or Umimi) input track name configurable.

I'm also dropping compatibility with pre C++17 code.

The immediate need for this is to study b-jet trigger using fast tracking. I'm marking it urgent for that reason. In the longer term we plan to disassemble JetBTaggerAlg a bit, this will be one of the components.

Tagging @duperrin, @sanmay

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