[mew-int 3115] Feedback during imap operations

It has seemed to me that sometimes, when I do an update from my IMAP
server, that the status is stuck in "Auth'ing" for a ridiculous amount
of time.

When I finally got around to investigating, I found that it is not
usually the authenticating that takes so long after all. Instead, I
see this when there are a large number of marks to be changed.

Typical scenario: I mark a few hundred messages that I haven't
downloaded before, then hit m-I to download all of them. Then I unmark
the whole bunch and update again to turn off the marks on the server
side. And when I do, the "Auth'ing" phase seems to take forever.

If possible, I'd like the status message to change as soon as
authentication is complete, in all cases.

- Harald