Feature request: Show whether e-mail of user is verified

[David Srbecky]

Related to: Proof of email ownership

There are a few robots that verify that user owns the e-mail.
There are a many more UNTRUSTED IDs than TRUSTED in my list. If enigmail
could specify whether the ID has been signed by robot, it would provide
significantly more information.

PS: A configurable list of trusted robots in the options panel may be
needed.

David