Add support for additional eduPerson attributes:

• eduPersonNickname, via generateCn
• eduPersonPrimaryAffiliation could be added if there were a way to populate it... person level affiliation perhaps (populated by an election configuration based on available roles)?
• eduPersonEntitlement could be added if it were calculable from something. Associated group memberships perhaps?
• eduPersonScopedAffiliation, with scope defined somewhere (at a CO level)
• eduPersonPrincipalNamePrior (note: multi valued)
• eduPersonUniqueId (note: single valued)
• eduPersonOrcid (note: multi valued)