[task #16222] Arithmetic operators to convert areas for example mag/arcsec2 to counts/pix

[Mohammad Akhlaghi]

Follow-up Comment #7, task #16222 (project gnuastro):

Thanks a lot Bharat, the commit looks good. 

There is just one thing that worries me: the 'gal_wcs_pixel_scale' function
which is called on every conversion. This function is computationally much
more complex than the actual unit conversion. So if someone wants to convert
thousands of values, 'gal_wcs_pixel_scale' will be called thousands of times.

A more robust way is to estimate the pixel scale once (before
'arithmetic_function_binary_flt' starts to parse the set of inputs), and pass
the pixel scale to 'gal_units_arcsecsq_to_pixnum' instead of the WCS ;-).

By the way, can you also implement the inverse operation? 


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