Implements the Analytical Norm-Conserving (ANC) regularized potential of Gygi
Description
Implements the Analytical Norm-Conserving (ANC) regularized potential of Gygi.
The value of the b parameters is also determined by the code using the root finder.
News snippet
Implements the Analytical Norm-Conserving (ANC) regularized potential of Gygi.
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.