Group-Office groupware and CRM

We've been working a lot on performance for this release. We're now using compression on the files so the startup time of Group-Office is much shorter.

Enhancements on the permissions system deliver a much better overall performance
on large installations.

We've also added a lot of new features like:

* Resource management to book meeting rooms for example
* Enhanced project manager
* Tickets or Helpdesk module
* A lot of small enhancements everywhere in the system.

Upgrading is recommended for everyone!