people.yaml/ORCID iD quality control checks

Christian Bartelt appears to be a single person who used 2 different ORCID iDs (and submitted a third paper without an ORCID iD).

Another individual recorded as multiple people is Massih R. Amini, who has 2 people.yaml entries:

```yaml
massih-r-amini:
names:
- {first: Massih R., last: Amini}
- {first: Massih-Reza, last: Amini}
massih-r-amini-4233:
names:
- {first: Massih R, last: Amini}
orcid: 0000-0001-9032-4233
```

I suppose the first one was created based on the name_variants.yaml entry

```yaml
- canonical: {first: Massih R., last: Amini}
variants:
- {first: Massih-Reza, last: Amini}
```

which specifies a period for the abbreviated version, so the variant with the ORCID iD didn't match.

Can we use heuristics to check for such cases that should be merged? E.g.:

- If a person without `orcid` and a person with `orcid` have names that vary only in punctuation/diacritics, but are not explicitly listed as similar names, they might be the same person.
- If a name occurs on very few papers, but has multiple people.yaml entries, they may be the same person (even if there are multiple ORCID iDs).