Fix conversion to single precision implied by the real Fortran function.
Description
Fix conversion to single precision implied by the real Fortran function. This makes the code apparently more stable (converges faster for GS) add the shape of the potential seems smoother.
News snippet
Fix conversion to single precision implied by the real Fortran function.
Checklist
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I have checked that my code follows the Octopus coding standards -
I have added tests for all the new features added in this request.