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Fix eta calculation for backward VELO tracks

Saverio Mariani requested to merge samarian_EtaVELOtracks_fix into master

While commissioning, it was noticed the eta calculation for VELO tracks, based on the momentum, gave nan. With this MR, the state() method on VELO tracks returns a KalmanVeloState instead of a KalmanState (using the conversion already available) and a method for eta calculation based on the slopes is added. Nothing changes for eta calculation of Basic/CompositeParticle.

By monitoring VELO tracks eta on simulation, the obtained distribution is shown below enclosed plot

Also, Velo::Track and Velo::TrackFitParameters structs, unused, are cleaned

Edited by Saverio Mariani

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