[task #16253] Warp: let the user determine the output projection CTYPE

[Mohammad Akhlaghi]

Update of task #16253 (project gnuastro):

        Percent Complete:                      0% => 90%                    

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Follow-up Comment #2:

The basic way this works in Gnuastro is like this:

There are no default values for options in the programs (that breaks the
modularity principle: options should be set outside of the programs). Instead,
each program's source directory has a configuration file inside of it also
(besides the '*.c' and '*.h' files. 

These configuration files later get installed in the installation path and the
programs load them after reading the command-line options. There is a full
section describing the Configuration file precedence
<https://www.gnu.org/software//gnuastro/manual/html_node/Configuration-file-precedence.html>
in the manual.

After all the parsing of the command-line options and configuration files are
done, the programs just check if an option they require has been given a value
or not. If not, the programs will abort, and let the user know that an
mandatory option, hasn't been assigned a value.

So the user doesn't give any value, the "default" value is read from these
configuration files. It is not hard-coded in the program source.

As one example of what the option should look like, see the '--ctype' option
of MakeProfiles in its configuration file
<https://git.savannah.gnu.org/cgit/gnuastro.git/tree/bin/mkprof/astmkprof.conf>.
You can even take the 'args.h' block for '--ctype' from and go ahead
MakeProfiles's args.h
<https://git.savannah.gnu.org/cgit/gnuastro.git/tree/bin/mkprof/args.h> ;-).

I am changing the status of this task to 90% because after you take the model
from MakeProfiles, you can directly implement this option (there isn't much
work needed after that) ;-).


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