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/forms.py

@@ -11,6 +11,7 @@ from datetime import datetime
 from StringIO import StringIO
 
 from django import forms
+from django.forms import extras
 from django.conf import settings
 from django.contrib.auth.models import User
 from django.utils.translation import ugettext as _
@@ -195,6 +196,7 @@ class TicketForm(forms.Form):
                 fieldclass = forms.BooleanField
             elif field.data_type == 'date':
                 fieldclass = forms.DateField
+                instanceargs['widget'] = extras.SelectDateWidget
             elif field.data_type == 'time':
                 fieldclass = forms.TimeField
             elif field.data_type == 'datetime':