Zafar a1

Best track calculation is added to THcHallCSpectrometer::TrackCalc method.
If fSelUsingScin == 0 then golden track is calcualted like podd i.e. first
track with sorting ON.
If fSelUsingScin == 1 then golden track is calculated as:
h_select_best_track_using_scin.h

This commit is after Steve Wood hass added more THaTrack functions and
before Vardant's commit Shower6 #63. Three of the new functions are set
here:
SetDedx in THcHodoscope::FineProcess ( at the end of method )
SetBetaChi2 in THcHodoscope::FineProcess ( at the end of method )
SetEnergy in THcShower::CoarseProcess

Now in addittion to previous values we have the following values for a
track and for the Golden track:
Beta, BetaChi2, Energy, and Dedx.