merge from 2.6 branch: use group subject (not name) when translating Session.subjectInfo into group list for Metacat's DocumentImpl. https://github.nceas.ucsb.edu/KNB/arctic-data/issues/163
merge from 2.6 branch: use group subject (not name) when translating Session.subjectInfo into group list for Metacat's DocumentImpl. https://github.nceas.ucsb.edu/KNB/arctic-data/issues/163