 25-Jul-2002:  CALACS 4.1a dithered, RPT-OBS ACSSUM fix
  9-Jul-2002:  CALACS 4.1 dithered RPT-OBS ASN table fix
  7-Jun-2002:  CALACS 4.0a ACSREJ error array fix, and ACSSUM memory fix.
 25-Apr-2002:  CALACS 4.0  (See History file).
 17-Apr-2002:  CALACS 3.6  Always perform 'doStat'.
 10-Apr-2002:  CALACS 3.5h ASN_STAT update in ASN table, and trl file fix.
  9-Apr-2002:  CALACS 3.5g ACSREJ corrections for dark time and sky values
                            BUNIT update to SCI/ERR instead of Primary header
 19-Mar-2002:  CALACS 3.5f Darktime corrected for CR-combined product, and
                                biassection shifted to 0-index from 1-index
  7-Feb-2002:  CALACS 3.5e Fixed trailer file creation for ASN tables, updated
                            BUNITs to ELECTRONS, cleaned up subarray
                            flat-fielding processing.
 30-Jan-2002:  CALACS 3.5d Update 'dophot' to be consistent with SYNPHOT
                            and correctly apply gain to flat-fields.
 18-Jan-2002:  CALACS 3.5c Fixes an SBC processing bug, and trailer file bug
 19-Dec-2001:  CALACS 3.5b
 10-Dec-2001:  CALACS 3.5a Computes darktime, and selects BPIX rows properly
                            and updates SIZAXIS keywords in trimmed product.
  9-Nov-2001:  CALACS 3.5  Support for final CCDTAB/OSCNTAB formats, and
                            bias reference images.
 23-Oct-2001:  CALACS 3.4  PHOTCORR finally works.
  6-Aug-2001:  CALACS 3.3  
 14-Nov-2000:  CALACS 3.2  First version installed in STSDAS
 14-Jan-1999   CALACS 2.0  (14-Jan-1999) First version installed in STLOCAL
 24-Nov-1998:  CALASC 1.0  (24-Nov-1998) compiled (1st trailer file version)
 11-Nov-1998:  CALACS 0.7a (11-Nov-1998) compiled
