[imp] A few problems with imp 3.1

[jlewis@lewis.org]

I'm testing imp 3.1 with horde 2.1 running on Red Hat 7.3, talking to a uw
imap server running on a separate older Red Hat system, hoping to upgrade
from an old imp 2.2 setup.

Some of my testers have found bugs, one of which I can reliably reproduce.
If I select a few inbox messages, mark them as deleted, click "purge 
deleted", and then click on a message after the deleted ones, I get the 
wrong message.  i.e. delete message 10, purge deleted, click on the new 
message 10, and you actually get message 11, as if the messages haven't 
been renumbered properly since some were removed.

Some testers are seeing things like:

Warning: Undefined index: 8 in /usr/local/horde-2.1/imp-3.1/message.php on      
line 219                                                                        
                                                                                
Warning: Cannot add header information - headers already sent by (output        
started at /usr/local/horde-2.1/imp-3.1/message.php:219) in                     
/usr/local/horde-2.1/imp-3.1/message.php on line 417                            

In that particular instance, the tester had just emptied the trash while
reading their inbox.  She clicked on a message that she hadn't read yet
and the above error messages appeared.  In similar circumstances, she's
also gotten 404 errors.

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 Jon Lewis *jlewis@lewis.org*|  I route
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