[task #16474] All non-WCS metadata should be in 0-th HDU

[Mohammad Akhlaghi]

URL:
  <https://savannah.gnu.org/task/?16474>

                 Summary: All non-WCS metadata should be in 0-th HDU
                   Group: GNU Astronomy Utilities
               Submitter: makhlaghi
               Submitted: Mon 01 Jan 2024 10:12:26 PM CET
         Should Start On: Mon 01 Jan 2024 12:00:00 AM CET
   Should be Finished on: Mon 01 Jan 2024 12:00:00 AM CET
                Category: All Gnuastro
                Priority: 5 - Normal
              Item Group: Enhancement
                  Status: In Progress
                 Privacy: Public
        Percent Complete: 40%
             Assigned to: makhlaghi
             Open/Closed: Open
         Discussion Lock: Any
                  Effort: 0.00


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Follow-up Comments:


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Date: Mon 01 Jan 2024 10:12:26 PM CET By: Mohammad Akhlaghi <makhlaghi>
As of [https://git.savannah.gnu.org/cgit/gnuastro.git/commit/?id=a78974a040
Commit a78974a040], in order to have a consistent metadata convention, all the
metadata (except the WCS) should be written in the 0-th HDU of the FITS
files.

As of [https://git.savannah.gnu.org/cgit/gnuastro.git/commit/?id=b19eedd
Commit b19eedd], this has been checked and validated for (alphabetically): 
* Arithmetic
* BuildProgram (doesn't produce a FITS output)
* ConvertType 
* Convolve 
* CosmicCal (doesn't produce a FITS output)
* Crop

We need to complete this for all Gnuastro programs.

Note that in the original
[https://git.savannah.gnu.org/cgit/gnuastro.git/commit/?id=a78974a040 Commit
a78974a040], the NoiseChisel and Segment date and versions metadata was
brought into the 0-th HDU, but not keywords like 'MED_STD' that get written in
some of the output HDUs. That is why they are not included in the list above.







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