"Checking for New Messages" Patch

By default, new IMAP messages quietly appear, either from a server
notification (does RC support this?), or a recurring client check.

Our users feel it's important to have a "Check for mail (now)"
button, as in other mail clients, and to be notified whenever an
automatic client check was being done.

This simple patch adds a "Check for new mail" button (using the
existing "inbox" graphic and "check_for_recent" function).

It also adds a "Checking for new messages..." a check is being done.
(see attached)

The patch (with a few localizations) is available from:

http://www.whidbey.com/richs/rc-checkmail.patch

If you're using the "rc-clickables" patch, please apply this one
first (or manually edit "skins/default/templates/mail.html" to add
the "imageSel" attribute).

Rich