[task #15799] Add the autocomplete feature to gnuastro

[Pedram Ashofteh Ardakani]

Follow-up Comment #10, task #15799 (project gnuastro):

I read a few articles about portability to Mac and previous versions. Keeping
them here might be helpful.

This can be really confusing ... Should we keep things compatible with
bash-3.2 [https://tiswww.case.edu/php/chet/bash/COMPAT (which is
still the `standard' version for Mac OS X)] or even older ones?

* A quick check on bash changes <https://mywiki.wooledge.org/BashFAQ/061>.
* A more extensive one <https://wiki.bash-hackers.org/scripting/bashchanges>.
* Bash compatibility <https://tiswww.case.edu/php/chet/bash/COMPAT> with
previous versions.
* Bash in GNU/Linux vs. MacOS
<https://unix.stackexchange.com/q/82244/359712>.
* Major differences from the Bourne Shell
<https://www.gnu.org/software/bash/manual/html_node/Major-Differences-From-The-Bourne-Shell.html>.

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