Which can be operated on in bulk
:mark-message will mark the selected message
:mark-message -i will mark the current message and any other messages you seek to, until you run it again.
These shall be bound to v and V, respectively, by default.
A ProvidesMessages interface will be grown and will return a list of messages. Commands which work on messages will be adjusted to work with a list, instead of just one message. In particular, I want
:pipeto grow support for piping multiple messages in the form of an mbox.