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Draft: New fastest track reconstruction sequence with UT

Andre Gunther requested to merge gunther_new_fastest_seq into master

This configures a new fastest track reconstruction sequence using the VeloUT tracking in filter mode, i.e. passing through most VELO tracks, as input to the Forward tracking. The Forward tracking uses the momentum estimate of the Upstream track, if available, to narrow its hit search window, gaining almost a factor 3 in throughput. In preliminary tests, this, and a reduction in ghost rate, improves the throughput of the track-reconstruction sequence by about 10%. It also recovers some of the tracks lost previously in the fastest sequence.

  • allow multiple Upstream tracks per VELO track
  • perform thorough test of efficiencies
  • perform thorough throughput tests
  • check effect in data if possible

Goes with Rec!3399

Closes #430

Edited by Andre Gunther

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