[task #16256] Warp: take the output WCS from another file

[Mohammad Akhlaghi]

Follow-up Comment #1, task #16256 (project gnuastro):

Indeed! That is a good idea ;-).

Besides the example you mentioned, it does usually happen that the WCS is in
another file after astrometry. So after calculating the astrometry, we have
two FITS files: the image in one FITS file, and its WCS headers in another! 

Currently we use Arithmetic (which also has '--wcsfile') to put the WCS
headers into the image, then call SWarp. But with Warp's new '--wcsfile'
option, we don't have to make that temporary file ;-).


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