Fixed one typo in response_helpers which caused is_admin context variable not to work correctly.
Created new checkLinkNameForId function that checks if link_name is correct when creating new user and modifying existing one. This is now used for validation instead of doesLinkNameBelongToId in UserForm clean_link_name function. The previous validation function didn't allow to create new users and modify linkname of existing ones. Additionally I created new doesLinkNameExist helper function.
from django.conf.urls.defaults import *
urlpatterns = patterns('',
# test_client modeltest urls
(r'^test_client/', include('modeltests.test_client.urls')),
# Always provide the auth system login and logout views
(r'^accounts/login/$', 'django.contrib.auth.views.login', {'template_name': 'login.html'}),
(r'^accounts/logout/$', 'django.contrib.auth.views.logout'),
# test urlconf for {% url %} template tag
(r'^url_tag/', include('regressiontests.templates.urls')),
)