[task #15670] Calculating reverse coefficients of TPV to SIP

[Mohammad Akhlaghi]

Follow-up Comment #1, task #15670 (project gnuastro):

Please implement the fitting of a 2D array with a polynomial through GSL as a
generic/modular function and call it for this task.

The reason I am suggesting this is that we can use such a function in several
other Gnuastro programs in other contexts. Later, we'll create a new '.h' file
(maybe called 'nlinfit.h' for non-linear fit) for it in Gnaustro's library. 

But for now, if its just a simple/modular function, it would be good: taking
in a 2D array (as 'gal_data_t' and a set of parameters) and returning an array
of polynomial coefficients (ideally as 'gal_data_t').

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