Refactoring KLI for electrons
Description
Refactor the Slater part of the KLI code for electrons to improve readability and performances. This also fixes a problem of a missing complex conjugate in the Slater part.
News snippet
Refactoring of the KLI code for electrons.
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.