PHP agenda version 2.2.3 released

This release fixes some bugs and makes the registration process more configurable.

In this release we have fixed some broken links on the main page. Only links for admins were affected.

We made the layout a bit more compact by moving the logout link to the top, next to the username, we moved the contact link to the footer and we removed the link to register as a new user.

The registration of new users can now be controlled by setting a flag in the config file. This makes is easier for sysadmins to deploy the agenda as a private agenda.

Admin users can always register new users, even when user registration is disabled in the config file.