[imp] Dynamic SEEN/UNSEEN Email status

[Patrick Domack]

I've been having an issue with having multible machines logged into  
webmail, since the last release. Emails read in one client, don't  
update on other clients. The status on the imap server changes, using  
other imap client programs reflect the changes correctly. So far the  
only *fix* is for me to logout, and wipe the cache on the webserver  
(apc).

IMP 5.0.19
Horde 4.0.14

$conf['cache']['default_lifetime'] = 86400;
$conf['cache']['params']['prefix'] = 'horde_';
$conf['cache']['driver'] = 'Apc';
$conf['cache']['compress'] = true;
$conf['cache']['use_memorycache'] = '';
$conf['cachecssparams']['driver'] = 'filesystem';
$conf['cachecssparams']['lifetime'] = 86400;
$conf['cachecssparams']['compress'] = 'php';
$conf['cachecss'] = true;
$conf['cachejsparams']['driver'] = 'filesystem';
$conf['cachejsparams']['compress'] = 'php';
$conf['cachejsparams']['lifetime'] = 86400;
$conf['cachejs'] = true;
$conf['cachethemesparams']['check'] = 'appversion';
$conf['cachethemesparams']['lifetime'] = 604800;
$conf['cachethemes'] = true;
$conf['sessionhandler']['type'] = 'Builtin';
$conf['sessionhandler']['memcache'] = false;