[Halld-cal] updated FCAL mc response study

[Richard Jones]

Hello Matt and all,

I have updated my FCAL mc response study to single-photon events (0-8 GeV)
in the forward direction. This shows the final adjustment in the energy
scaling factors in hdgeant and hdgeant4. Unless I hear something to the
contrary, I consider the energy scale issue reported on github
Jeffersonlab/hdgeant4 to be resolved, if someone could agree and make it as
resolved.

Also shown in the updated report is a new timing comparison study, where I
used the position recorded for the fcal shower together with the mc
generated vertex information to produce a time-of-flight corrected shower
time, which should be zero if the reconstruction and simulation are
consistent. Notice that there is still a residual time-walk that we might
want to understand and correct.

https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=3852

-Richard Jones
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