IMPORTANT - database schema change (more info in change log).
I hope I got this change in early enough before anyone started
to use polymorphic.py in earnest. Sorry for any inconvenience.
This should be the final DB schema now.
Django's ContentType is now used instead of app-label and model-name
This is a cleaner and more efficient solution
Thanks to Ilya Semenov for the suggestion.
Kind Regards,
Bert Constantin