IMPORTANT: DB schema changed: Django's ContentType is now used

instead of app-label and model-name (suggested by Ilya Semenov in issue 3).
This is a cleaner and more efficient solution, and applabel/modelname
are not stored redundantly in additional tables any more (the polymorphic models).
This should be the final DB schema now (sorry for any inconvenience).
Also some minor documentation updates.

poly/management/commands/polycmd.py

@@ -7,6 +7,7 @@ from django.core.management.base import NoArgsCommand
 from django.db.models import connection
 from poly.models import *
 from pprint import pprint
+import settings
 
 def reset_queries():
     connection.queries=[]
@@ -18,9 +19,9 @@ class Command(NoArgsCommand):
     help = ""
 
     def handle_noargs(self, **options):
-        print "polycmd"
-
-
+        print 'polycmd - sqlite test db is stored in:',settings.DATABASE_NAME
+        print
+        
         Project.objects.all().delete()
         o=Project.objects.create(topic="John's gathering")
         o=ArtProject.objects.create(topic="Sculpting with Tim", artist="T. Turner")