plug users and hosting packages together

- document new feature in changelog
- add autogenerated documentation for osusers.urls and osusers.views
- add osuser URLs to gnuviechadmin.urls
- implement get_absolute_url in hostingpackages.models.CustomerHostingPackage
- use set_ldap_user_password instead of create_ldap_user for existing OS users
  in osusers.models.User.set_password
- add URL pattern set_osuser_password in osusers.urls
- implement osusers.views.SetOsUserPassword to set the password of an existing
  operating system user
- link to hosting package detail view on user dashboard
- add template hostingpackages/customerhostingpackage_detail.html
- add template osusers/user_setpassword.html

gnuviechadmin/templates/dashboard/user_dashboard.html

@@ -22,7 +22,7 @@
           <tbody>
             {% for package in hosting_packages %}
             <tr>
-              <th>{{ package.name }}</th>
+              <th><a href="{{ package.get_absolute_url }}" title="{% blocktrans with packagename=package.name %}Show details for {{ packagename }}{% endblocktrans %}">{{ package.name }}</a></th>
               <th>
                 {% with diskspace=package.get_disk_space %}
                 <span title="{% blocktrans %}The reserved disk space for your hosting package is {{ diskspace }} bytes.{% endblocktrans %}">{{ diskspace|filesizeformat }}</span>