[Halld-cal] FCAL non-linear correction

[Igal Jaegle]

All,

I made an entry in the FCAL logbook, https://logbooks.jlab.org/entry/3810625.

It remains to be proven that one function and one set of parameters can be used for all rings.  In the standard GlueX FCAL energy calibration, after a new non-linear correction is applied, in principle the gains should be cross-checked and re-match if needed, and so on, until the gains and non-linear parameters are converging. I suggest that more robust QA/QC be used for the FCAL energy calibration (I will make a pull request with my improvements later today to FCAL_Pi0HFA) and that Colin continues the FCAL energy calibration until he sees no changes in the gains and the non-linear parameters for examples by using the QA that the gain should be updated only if the fabs(new gain-old gain)/old gain > 1-1.5% depending on the standard GlueX QA.

tks ig.

PS: I think, the classical approach while maybe more complicated, requires fewer iterations and is working at least for pi0!
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