[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

profiles/utils.py

@@ -0,0 +1,45 @@
+"""
+Utility functions for retrieving and generating forms for the
+site-specific user profile model specified in the
+``AUTH_PROFILE_MODULE`` setting.
+
+"""
+
+from django import forms
+from django.conf import settings
+from django.contrib.auth.models import SiteProfileNotAvailable
+from django.db.models import get_model
+
+
+def get_profile_model():
+    """
+    Return the model class for the currently-active user profile
+    model, as defined by the ``AUTH_PROFILE_MODULE`` setting. If that
+    setting is missing, raise
+    ``django.contrib.auth.models.SiteProfileNotAvailable``.
+    
+    """
+    if (not hasattr(settings, 'AUTH_PROFILE_MODULE')) or \
+           (not settings.AUTH_PROFILE_MODULE):
+        raise SiteProfileNotAvailable
+    profile_mod = get_model(*settings.AUTH_PROFILE_MODULE.split('.'))
+    if profile_mod is None:
+        raise SiteProfileNotAvailable
+    return profile_mod
+
+
+def get_profile_form():
+    """
+    Return a form class (a subclass of the default ``ModelForm``)
+    suitable for creating/editing instances of the site-specific user
+    profile model, as defined by the ``AUTH_PROFILE_MODULE``
+    setting. If that setting is missing, raise
+    ``django.contrib.auth.models.SiteProfileNotAvailable``.
+    
+    """
+    profile_mod = get_profile_model()
+    class _ProfileForm(forms.ModelForm):
+        class Meta:
+            model = profile_mod
+            exclude = ('user',) # User will be filled in by the view.
+    return _ProfileForm