Re-organized imports, removing a couple that were unused.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@7912 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/db/models/query.py

@@ -1,17 +1,16 @@
 import warnings
+try:
+    set
+except NameError:
+    from sets import Set as set     # Python 2.3 fallback
 
-from django.conf import settings
 from django.db import connection, transaction, IntegrityError
-from django.db.models.fields import DateField, FieldDoesNotExist
+from django.db.models.fields import DateField
 from django.db.models.query_utils import Q, select_related_descend
 from django.db.models import signals, sql
 from django.dispatch import dispatcher
 from django.utils.datastructures import SortedDict
 
-try:
-    set
-except NameError:
-    from sets import Set as set     # Python 2.3 fallback
 
 # Used to control how many objects are worked with at once in some cases (e.g.
 # when deleting objects).