Resolve "Inconsistency in softening parameter for soft_coulomb species"
Description
The issue #1219 (closed) stated a possible bug with regards to the softening parameter. By closer inspection, one sees that the code is correct, but very misleading. Here we rename some variables to make the code cleaner and better readable.
News snippet
Clean up misleading variable names.
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.
Closes #1219 (closed)