Fixed support for return of single values
Merge branch 'master' of https://github.com/collectiveaccess/providence
PROV-508 This issue is not actually about parents being mangeled on import. Actually, what's going on is this: the mapping is for collections, but it is also bringing in related collections via a "PartOf" relationship. The titles of the related collections were being misinterpreted as labels for the primary collection (the one being imported) rather than being marked as a related record. Code has been added to analyze the content tree pre-import and mark related data as related.