fobj: string or PyFITS HDUList object or None :
a file name, e.g j9irw4b1q_flt.fits
a fully qualified filename[EXTNAME,EXTNUM], e.g. j9irw4b1q_flt.fits[sci,1]
a pyfits file object, e.g pyfits.open(‘j9irw4b1q_flt.fits’), in which case the
user is responsible for closing the file object.
ext: int or None :
extension number
if ext==None, it is assumed the data is in the primary hdu
minerr: float :
minimum value a distortion correction must have in order to be applied.
If CPERRja, CQERRja are smaller than minerr, the corersponding
distortion is not applied.
wcskey: str :
A one character A-Z or ” ” used to retrieve and define an
alternate WCS description.
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