The property wasLastModifiedAt disappeared without a trace

[uscholdm]

We used to have a property called wasLastModifiedAt (see below). It disappeared with the new time changes in the 11.0.0 release. There is no mention of it in the release notes, so I'm wondering if it was an oversight and we still want it. If we want to restore a property with this meaning, I propose that it be named lastModifiedDateTime. In any event the release notes should mention it. See also #693 and #762

gist:wasLastModifiedAt
	a owl:ObjectProperty ;
	rdfs:subPropertyOf gist:hasActual ;
	rdfs:range gist:TimeInstant ;
	skos:definition "Date that something was last modified."^^xsd:string ;
	skos:prefLabel "was last modified at"^^xsd:string ;
	.

[uscholdm]

PROPOSAL:

• find out whether we want this.
• if so, add it
• if not, consider updating release note so there is a record of its removal, if it's possible to go back in time in a good way.

[Jamie-SA]

Also related to #771 ?