Had to fix the test fixtures data to work with the new handle-IDs in Mint,
and while doing so I made the 008_people.t more complete and robust.
Updated the test fixtures to work with the modified list of staff.
CoataGlue::Person now requires a CoataGlue::Source and does the handle-
prefixing in encrypt_id rather than relying on the calling code to do it.
All tests passing.