TNTP changes to core

The TNTP extensions require changes to the 2.0/2.1 data standard. They are:

• The addition of three fields to Common Type Credential:
  • string CredentialIdentifier
    documentation 'Identifier or serial number assigned to the credential.
    is optional
    max length 50
  • bool CurrentCredential
    documentation 'Indicator of whether this is the credential currently being used for employment.
    is optional
  • string CredentialEndorsement
    documentation 'Endorsements are attachments to teaching certificates and indicate areas of specialization.
    is optional collection
    max length 255

• Demoting three fields of OpenStaffPosition that were part of the identity to only be required: descriptor EmploymentStatus, descriptor StaffClassification, date DatePosted.

• Changing HispanicLatinoEthnicity on Staff to be optional rather than required.