return grid point
small change
small change
dont delete atoms.json
update of dft_loop
more tests to be added
small fix
move code to cpp
small fix
small update
small update
small update
bound_state returns enu
pass grid_type
todo in cmd_args.h
simplification
some improvements in radial_grid
Bugfix in radial solver.

Spline of potential was not interpolated (forgotten) after previous
simplifications.

Lesson taken: objects (for example, Spline) must not try to be
"smart" and make some predefined assumptions.
Spline is simplified
bare atomic potential test must be rewritten