Delete person method should be standard for FRServiceHandler and part of the public API

[JamesBeach]

Deleting a person from a service is a useful function for testing if not for the Authentication Server and one that should be reliably available for service handler implementations. Should a service not support deletions like this, it can simply swallow the request.

For similar reasons, deletions should be supported by the public API, even if the Authentication Server does not use it.