Resolve "Minor tweaks to native tier and DFT"

Nathan Daelman requested to merge 1539-minor-tweaks-to-native-tier-and-dft into develop

Closes #1539 (closed)

Also applies the correction to the Gaussian parser in https://github.com/nomad-coe/electronic-parsers/pull/121

The amendments to Basis Set Type in GW and BSE will be applied later on in a different issue, as discussed with @pizarroj

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