[horde] How to configure DAV storage backend?

[Rick Romero]

  Quoting Andy Dorman <adorman at ironicdesign.com>:

> I have been alpha testing the latest "debian installed" (from Debian
> unstable) Horde groupware webmail and just ran into a problem.  I
> suspect the issue is a version mismatch between Horde-core and Kronolith
> & Nag, but I want to confirm before waiting for Debian packaging for
> Horde-core 5.1...
>
> My initial install (a couple of months ago) for Horde Groupware Webmail
> 5.04/kronolith 4.04/Nag 4.0.4 went smoothly.  My initial testing went
> well too.  I was able to create calendars, events and task lists with no
> problem.
>
> Since that time Kronolith and Nag have upgraded in Debian a couple of
> times, the latest was to 4.1.1 & 4.1.0 respectively which I installed
> this past weekend.  Horde core in Debian is still 5.04.

Are you pulling from unstable as described in the Debian Wiki?   Horde
core in unstable is 5.1.1 (Groupware 5.1.0), and recently there was a
broken dependancy that required trean, but there was no trean package. 

Rick