[imp] new mail count in folders

[Chuck Hagenbuch]

Quoting Yohann Fourteau <yohann.fourteau@shom.fr>:

> When I have a mail with flag deleted and new, it appears in the count in
> the folders view. Maybe it would be good not to count deleted new mail ?

The only way we can do these counts with reasonable speed is to use imap_status
(), which just returns the number of new messages. Also, I believe that's 
consistent with every mail client that I'm aware of...

-chuck

--
Charles Hagenbuch, <chuck@horde.org>
"Live, from Washington, where the doctors were telling us what they did, and
 did not, do with Vice President Cheney." -Dan Rather