JUL 2010 J. Anderson defined original PHI and PSI.
AUG 2010 P. L. Lim entered original PHI and PSI into FITS.
NOV 2010 P. L. Lim added RN2_NIT keyword value.
APR 2011 J. Anderson updated CTE algorithm.
APR 2011 M. Davis updated reference file code with new parameters.
MAY 2011 M. Davis changed RN2_NIT parameter to RN_CLIP.
JUL 2011 M. Davis added time dependent CHG_LEAK# extensions
JUL 2011 M. Davis added time dependent CTE scaling extension
NOV 2011 M. Davis updated parameters for CTE algorithm version 3.0
JAN 2012 M. Davis updated parameters for CTE algorithm version 3.1
AUG 2013 P. L. Lim removed overscan from COL_SCALE for CALACS 8.2
