major updates to the ILS calc, documentation, and preprocessing

 - revised normalization in newILS.m, as suggested by Yong Han

 - added motmsc/calmain_c1.m and calmain_c2.m, two variations on
   the reference calibration equation

 - added doc/ccast_eqns, Latex slides including the ILS integral,
   reference calibration equation, and variations c1 and c2

 - updated the ccast preprocessing, replacing the old do_rdr2mat
   with ccast_prepro.m and an sbatch script ccast_prepro.sh