Cleanup needed

RFC 2231 talks about the elements of a MIME header as “parameters” instead of “attributes”. RFC 2045 specifies the same vocab. We should normalize.

Let’s use “cert” where we mean “cert” and “key” where we mean “key”

user-facing material probably should use “app” – for technical documentation, we need to settle internally on “agent” or “client” or “MUA” or “MUAA”

glossary for technical documentation.