* add key fixture with no email, and 2 word comment
* tests for key without email and with comment
* handle comments in public key uids
* fix tests, you have to use email address
* fix text
* confirm that email addresses contain an @ symbol
* improve comments about keys/fixtures
* test that hiding secret with expired key fails
* add test of user key without username.
* revert to performing most tests with 'user1'.
* move user4 private/public key fixtures
* factor code fetching emails from keyrings, add comments.
* use factored _warn_or_abort()
* add to, clean up, and clarify comments.
