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CTPPS: x-to-xi interpolation

Pedro Vieira De Castro Ferreira Da Silva requested to merge github/fork/forthommel/80x_rereco_rev_ctppsleaves into 80x_rereco_rev

Created by: forthommel

This PR introduces the horizontal displacement/longitudinal proton momentum loss (aka x-to-xi) interpolation for pre-TS2 2016 data taking.

It relies on a set of conversion curves obtained from the linearised proton transport equation parameterising the beamline lattice (see these slides).

The fill-by-fill Roman pots alignment (based on the matching of track origin distribution with respect to dedicated "alignment runs" ; see here) is also applied upstream to the interpolation.

Several lookup-tables are introduced to ease the code readability.

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