[horde] new cyrus/sql driver for admin/users

[Ilya]

> > this is a driver for cyrus-imap with sql backend, derrived from sql
> > driver. It allows to:
>
> Cool - committed. However, I cleaned up a lot of stuff - more than half of
> this was a direct copy of the Auth_sql class, so I just made it extend
> Auth_sql and only override what it needs to. Much cleaner, but I haven't
> tested it, so you should take a look.


ill definatelly take a look and learn.

>
> > In order to use this driver you need following entries in your
> > horde/config/conf.php:
>
> Why the addition of $conf['users'] ?


the reason is, that if I use single login for horde/imp, than auth[driver]
has to be application, but I need it as cyrsql.
I tried to use auth[driver]=cyrsql for logins as well and it works, but it
introduces double login.