[Hallcsw] Updated Single arm SHMS MC

[Mark Jones]

Dave Gaskell, Dipankar Dutta  and myself have
updated the single SHMS MC to have the most recent
forward/back optics matrix and magnet apertures.
The link for info on getting the tarball is
at
  https://hallcweb.jlab.org/wiki/index.php/SHMS_Single_arm_Monte_Carlo

I will put the updated SHMS in SIMC this week
and send another email when it is done.

                  Cheers,
                         Mark