[dev] Patch to add application admin to the horde admin menu

[Chuck Hagenbuch]

Quoting "Marcus I. Ryan" <marcus@riboflavin.net>:

> As discussed on IRC, this patch adds the ability to define
> "administration" service(s) for applications, and displays links to them
> on the Horde administration menu page.  It also adds a function to the
> registry that returns a list of the defined applications.

Tweaked a bunch and committed. Thanks!

-chuck

--
Charles Hagenbuch, <chuck@horde.org>
"A dream which helps you to live your reality with dignity
 and justice is a good dream." - Tariq Ramadan