[task #15945] Use WCSLIB's new wcspcx() function to clean PC/CD matrices

[Mohammad Akhlaghi]

URL:
  <https://savannah.gnu.org/task/?15945>

                 Summary: Use WCSLIB's new wcspcx() function to clean PC/CD
matrices
                 Project: GNU Astronomy Utilities
            Submitted by: makhlaghi
            Submitted on: Wed 14 Apr 2021 06:44:38 PM BST
         Should Start On: Wed 14 Apr 2021 12:00:00 AM BST
   Should be Finished on: Wed 14 Apr 2021 12:00:00 AM BST
                Category: Libraries
                Priority: 5 - Normal
              Item Group: Enhancement
                  Status: None
                 Privacy: Public
        Percent Complete: 0%
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
                  Effort: 0.00

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Details:

In version 7.6, WCSLIB has added a new 'wcspcx' function
<https://www.atnf.csiro.au/people/mcalabre/WCS/CHANGES> to unscramble the
PC+CDELT and CD matrix usage (while taking into account that some distortions
like TPV don't work easily with PC+CDELT).

We should thus add this function (when the user's WCSLIB has it) to the
'gal_wcs_read_fitsptr' function in lib/wcs.c
<http://git.savannah.gnu.org/cgit/gnuastro.git/tree/lib/wcs.c>.




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