modified:   CMakeLists.txt

	modified:   .gitlab-ci.yml
	modified:   containers/docker/Dockerfile

	modified:   .gitlab-ci.yml

	modified:   containers/docker/Dockerfile

Dave Mack introduced two new variables to the
calculation of beam current to described correction for
the nonlinearity above 60uA in BCM1 and BCM2
seen in the Fall 18, Spring 19 and Summer 19running.
See for example summer 2019
hallcweb.jlab.org/doc-private/ShowDocument?docid=1037
Fall 18/Spring 19
hallcweb.jlab.org/doc-private/ShowDocument?docid=1042

For a BCM scaler read the difference, Dcounts, from the
previous scaler and get the time difference, Dtime.
Original calculation is:
I = (Dcounts/Dtime-fBCMOffset)/BCM_Gain
Now add an non-linearity correction
I = I + fBCM_SatQuadratic*Max(I-fBCM_SatOffset,0.0)^2

Add parameters fBCM_SatOffset and fBCM_SatQuadratic
that can be optional read-in. If parameters are
not read-in the parameters are set to zero, so
there is no correction.

Add the non-linearity correction to all BCM current
calculations.

1.  If THcHelicity is told about the THcHelicityScaler object with
    the SetHelicityScaler method, it will use helicity scaler events
    to jump start generating the seed
2.  When beam off, helicity decoding can get lost if the helicity_freq
    parameter is not very close to the actual helicity reversal frequency
    (which seems to drift).  THcHelicity now calculates a recommended value
    of helicity_freq.

This is not an ideal way of doing things but it is only temporary.

Add parameters to hold helicity scaler results:
  g%s_hscaler_plus[%d]
  g%s_hscaler_minus[%d]
  g%s_hscaler_sum[%d]
  g%s_hscaler_asy[%d]
  g%s_hscaler_asyerr[%d]
  g%s_hscaler_time (Time with defined helicity)
  g%s_hscaler_time_asy
  g%s_hscaler_triggers	(All triggers including where helicity not decoded)
  g%s_hscaler_triggers_plus
  g%s_hscaler_triggers_minus  (plus+minus is slightly less than triggers)
  g%s_hscaler_trigger_asy

%s is name assigned to THcHelicityScaler object
%d is scaler channel #.  0-31

  Now for 30 Hz, need to override in parameter file

	modified:   THcHelicity.cxx
	modified:   THcHelicity.h