Nicolas Tancogne-Dejean requested to merge filtering_pseudo into main Sep 05, 2023

Description

Minor fixes for the splines:

Properly treat the underflows
Properly perform the Fourier transform depending on the l value and with the correct cutoff
Fixes a formating problem when printing splines with value below 1e-99 which was producing an output like 1.XXX-100 instead of 1.XXXE-100.

Correctly treating GSL interface using iso_c_binding.

Copy the full range of HGH projectors before fitting by a spline.

Add some OpenMP support.

News snippet

Small code improvements

Checklist

I have checked that my code follows the Octopus coding standards
I have added tests for all the new features added in this request.