Seeding and Truth information improvements

[pbutti]

There are some issues with the seeding in the tagger and recoil volumes that need to be investigated. However the current processors are rather confusing in terms of functionalities and implementations. Additionally, we should have a better handle on the technical efficiency.

--- Implementation changes The TruthSeedProcessor should made clear that it provides both truth tracks and seeds. The way seed tracks are provided for recoil and tagger tracker will differ, so I think:

• Make 1 base class for the TruthSeedProcessor
• Make 2 derived classes for the Tagger and Recoil respectively.

--- Setup a truth track analysis Check the Nhits distribution on the electron beam Survival rate of electrons to the target surface ...

[tvami]

One should also have

  event.add("beamElectrons", beam_electrons);
  event.add("TaggerTruthTracks", tagger_truth_tracks);
  event.add("RecoilTruthTracks", recoil_truth_tracks);
  event.add("TaggerTruthSeeds", tagger_truth_seeds);
  event.add("RecoilTruthSeeds", recoil_truth_seeds);

configurable in the next iteration of this producer