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/urls.py

@@ -80,6 +80,10 @@ urlpatterns = patterns('helpdesk.views.staff',
     url(r'^tickets/(?P<ticket_id>[0-9]+)/dependency/delete/(?P<dependency_id>[0-9]+)/$',
         'ticket_dependency_del',
         name='helpdesk_ticket_dependency_del'),
+        
+    url(r'^tickets/(?P<ticket_id>[0-9]+)/attachment_delete/(?P<attachment_id>[0-9]+)/$',
+        'attachment_del',
+        name='helpdesk_attachment_del'),
 
     url(r'^raw/(?P<type>\w+)/$',
         'raw_details',