Big bugfix release - addresses a number of issues introduced in recent Django

updates, and other bugs in the codebase. Many thanks to David Clymer and
Chris Etcp for reporting these bugs and then providing fixes.

Tickets closed:

#3: BUG E-Mail Script Incompatible with Python 2.5
#4: BUG Failure on empty attachments
#5: ENHANCEMENT Run scripts as command extensions [Backwards Compatible]
#7: BUG Cannot view tickets when not logged in
#8: BUG Overly broad error handling

Note that #5 is backwards-incompatible, as you need to change any CRON or 
scheduler entries for the 'get_email.py', 'escalate_tickets.py' or 
'create_escalation_exclusions.py' scripts. See the README file for the new 
commands.

forms.py

@@ -57,7 +57,7 @@ class TicketForm(forms.Form):
             try:
                 u = User.objects.get(id=self.cleaned_data['assigned_to'])
                 t.assigned_to = u
-            except:
+            except User.DoesNotExist:
                 t.assigned_to = None
         t.save()