convert accounts app to south; add user profile model
Update wsgi config
user profile edit page
Merge branch 'stable'; commit '66760cfbc00b449'
question preview/download uses user's language
change password page; link to edit profile page
Merge branch 'master' of github.com:numbas/editor
fix registration.models import; edit profile link always shown
add CAN_CHANGE_PASSWORD setting.

Should probably just keep track of who has logged in through LDAP/Shibboleth somehow.
Merge branch 'master' of github.com:numbas/editor