This update to CALACS in HSTCAL revises the computation of the mean bias level that gets reported in the _flt.fits header. The change sums the mean bias level subtracted in all the steps and prints out a trailer message reporting the values being subtracted by each step. It was tested using an ACS dataset which initially only reported the bias level from the last correction in the header as the MEANBLEV value, but it now reports the full correction.  
This update to CALACS in HSTCAL revises the computation of the mean bias level that gets reported in the _flt.fits header. The change sums the mean bias level subtracted in all the steps and prints out a trailer message reporting the values being subtracted by each step. It was tested using an ACS dataset which initially only reported the bias level from the last correction in the header as the MEANBLEV value, but it now reports the full correction.  


git-svn-id: cc674101e2b794ddc2100b657215d55256e3fd48@16263 fe389314-cf27-0410-b35b-8c050e845b92

jhunkeler/hstcal,jhunkeler/hstcal,jhunkeler/hstcal