DOS normalization (FHIaims, VASP, exciting)
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This MR resolves #728 (closed) and #868 (closed). It is accompanied by https://github.com/nomad-coe/electronic-parsers/pull/16 on the parser side.
Basically, the DOS in FHIaims, VASP, exciting were incorrectly scaled at the parser side:
they no longer lead to integer electrons when integrating over a band.
Moreover, the total DOS in older FHIaims versions was off by a factor of 2 (regardless of spin).
Projected DOS or bands were not affected.
This MR updates the parsers and adds the new metadata entry raw_data_normalization_factor, to store the original FHIaims DOS without any correction.
Up to now, this metadata only applies to FHIaims, so I could also move it to that parser's specific metadata.