[New data item]: Method for indicating the data source for a structure - experimental vs calculated about cif_core HOT 3 OPEN

Relevant discussion in the coreDMG mailing list: https://www.iucr.org/__data/iucr/lists/coredmg/msg00429.html

There was also a similar discussion by the OPTIMADE developers on introducing a similar enumerator (Materials-Consortia/OPTIMADE#455), however, it was quite difficult to agree on a limit where "experimental" ends and "theoretical" begins. The different types of "theoretical" methods also turned out quite difficult to agree upon.

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I missed _exptl.method in searching core.

That does look like the place to put this information, and yes, an enumeration does have a nice appeal.

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I think it would be good to pick up @vaitkus 's suggestions in the COMCIFS thread he references above.

The issue is basically whether or not to redefine our own _exptl.method to bring it into line with mmCIF - how many CIFs would we invalidate because they didn't have recognised enumerated values?

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