Clean oct conductivity
Description
Clean the code of oct-conductivity Use some internal routines already existing when possible Compute the inverse dielectric function from the optical conductivity Parse the strength of the GaugeVectorField quick when present
Closes #240 (closed) #241 (closed).
News snippet
Improved oct-conductivity utility.
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.