make django-helpdesk more customizable + bug fixes:

- look at settings.py for all new options regarding customization.
- settings can be accessed inside the templates via the new
  templatetag 'load_helpdesk_settings'

- allow editing of personal followups, but only if followup does not
  contain any ticketchanges - otherwise this information is lost after
  the editing.
- add 'delete' link to attachments
- link to list of closed tickets in queue overview
- add 'closed & resolved' section to dashboard
- hide 'pre-set reply' box if no pre-set replies are found.
- use 'SelectDateWidget' for custom DateField

- fix how we update followups so that attachments don't get deleted
- fix bug where resolution emails contained the solution 'None'
- fix stats crashing bug
- fix locale bug

helpdesk/views/public.py

@@ -22,7 +22,10 @@ from helpdesk.models import Ticket, Queue, UserSettings
 
 
 def homepage(request):
-    if request.user.is_staff:
+    if not request.user.is_authenticated() and helpdesk_settings.HELPDESK_REDIRECT_TO_LOGIN_BY_DEFAULT:
+        return HttpResponseRedirect(reverse('login'))
+
+    if (request.user.is_staff or (request.user.is_authenticated() and helpdesk_settings.HELPDESK_ALLOW_NON_STAFF_TICKET_UPDATE)):
         try:
             if getattr(request.user.usersettings.settings, 'login_view_ticketlist', False):
                 return HttpResponseRedirect(reverse('helpdesk_list'))