[svn] Add user registration and user profiles.

Used modified versions of django-registration and django-profiles , both on bitbucket.

The Person model is now set up as the profile for auth.User s.

I set up a requestcontext so that settings is automatically passed to every template, no need to repeat ourselves in views. However, this needs to be refined: I will soon change it to only pass a subset of settings. E.G. we do not need to be passing the DB login and password!
Copied from http://cucc@cucc.survex.com/svn/trunk/expoweb/troggle/, rev. 8231 by aaron @ 1/29/2009 11:02 PM

registration/management/commands/cleanupregistration.py

@@ -0,0 +1,19 @@
+"""
+A management command which deletes expired accounts (e.g.,
+accounts which signed up but never activated) from the database.
+
+Calls ``RegistrationProfile.objects.delete_expired_users()``, which
+contains the actual logic for determining which accounts are deleted.
+
+"""
+
+from django.core.management.base import NoArgsCommand
+
+from registration.models import RegistrationProfile
+
+
+class Command(NoArgsCommand):
+    help = "Delete expired user registrations from the database"
+
+    def handle_noargs(self, **options):
+        RegistrationProfile.objects.delete_expired_users()