Add Hodoscope features: Time differences and beta
      Compute time differences between planes
      Calculate beta and Chisquard for each track in the hodoscope.
      New variables: fBeta, fBetaChisq
      New histograms for time differences
Simplification of variables for Shower Counter calibration

Remove track related variables from the HMS Shower class, use ntuples
from the track (H.tr) block instead in the HMS calorimeter calibration
scripts.

- Remove a block of duplicated track related variables from the
THcShower class which have been added for calorimeter calibration
purposes.

- In hcal_calib directory, replace those variables with correspondent
variables from H.tr block in the calorimeter calibration class
(THcShowerCalib.h), in the cut (hcal_replay_cuts.def) and output
(output_hcal_replay.def) definitions.
Fix definitions of fBeta, fBetaChisq and fFPTime.
    Time difference variables now defined in output.def