Forbid to run fully relativistic UPF2
Description
Forbid to use fully relativistic UPF2 pseudopotentials as this is not supported at the moment.
This does not addresses #147 but avoids to run the code and to get wrong results.
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.
Edited by Nicolas Tancogne-Dejean