Rename system to electrons
Description
Renamed system_t to electrons_t and made it into a proper class. Started reorganizing the folder structure of the sources.
News snippet
Renamed system to electrons.
Contributes to #354 (closed)
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.
Contributes to #354 (closed)
Edited by Micael Oliveira