Fifth release (V1.2.2) February 2002 [minor changes to "final" POA FOS].
 V1.2.2 - The scattered light correction switch is now being turned off
        using the POA FOS pre-processor script instead the pipeline itself;  
        even though no POA processing will perform the scattered light 
        correction, we've left the possibility of allowing the user to 
        switch the correction on in the POA pipeline.
      - V1.2.1 set the flux calibration corrections to OMIT if WAV_CORR was
        turned off;  however, these flux corrections should have been set
        to SKIPPED;  this has now been fixed.
      - 15 POA flatfield reference file headers have been updated in order
        to be CDBS compliant (USEAFTER - changed format, DESCRIP - added, 
        PEDIGREE - added)
      - Renamed 'poa_procfos_all' task to 'processfos'.

Forth release (V1.2.1) November 2001 [minor changes to "final" POA FOS].
 V1.2.1 - Bug fixes were done for Dec Alpha compilation problems.
      - Six more POA re-processed flatfields were added;  these were
	mistakenly missed in the previous releases.
      - The tool 'pfos_pix2wav' was updated;  sub-pixel corrections can
	now be made for input pixel positions;  wavelengths can even be
	calculated for IMAGE mode data.
      - The POA sample data repository was updated with more example 
	data files.
      - The scattered light correction has been turned off for all cases
	in the poa_calfos pipeline.
      - Bug fix: If WAV_CORR was turned off, then none of the flux
	calibration corrections could be performed;  they are now being
	turned off as well.
      - POA dispersion coeff reference table (ccs6) was updated with 
	changes to the H40 coeffs which were more accurate after more 
	scientific verification was performed.
      - The task 'pfos_dispfit' was added as a new POA FOS tool;  it is
	used to obtain dispersion coefficients for FOS ccs6 reference file.