[task #16012] Use WCSLIB's wcspcx function to split CDi_j

[Mohammad Akhlaghi]

URL:
  <https://savannah.gnu.org/task/?16012>

                 Summary: Use WCSLIB's wcspcx function to split CDi_j
                 Project: GNU Astronomy Utilities
            Submitted by: makhlaghi
            Submitted on: Mon 12 Jul 2021 02:59:13 AM BST
         Should Start On: Mon 12 Jul 2021 12:00:00 AM BST
   Should be Finished on: Mon 12 Jul 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:

With version 7.6, WCSLIB has recently added the wcspcx() function
<https://www.atnf.csiro.au/people/mcalabre/WCS/wcslib/wcsfix_8h.html#a7b70e8127424672db38ce3e653e46467>
to split CDi_j matrix when it won't interfere with the distortion. 

It is still relatively recent (released on April 2021), so many users will
probably not have it yet. But in a year or so, most users should have it, for
us to assume it in Gnuastro. We can add a configure-time check for it and use
it where necessary.




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