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Add track selection to DL2

Dan Guest requested to merge dguest/athena:add-dl2-track-selection into 21.2

We train IPRNN with a track selection similar to IP3D. In DL2 there was previously no way to apply a track selection, so I've added it with this commit. For now there are two hardcoded track selections:

  • ALL: select all the tracks.
  • IP3D_2018: what we were using in IP3D around the end of 2018.

As with many of the DL2 input behaviors, the track order is currently determined via regexes that parse the NN file. The list of regular expressions is currently hardcoded in DL2HighLevel.cxx.

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