Fixed #3163 -- Add a "Meta.managed" option to models.

This allows a model to be defined which is not subject to database table
creation and removal. Useful for models that sit over existing tables or
database views.

Thanks to Alexander Myodov, Wolfgang Kriesing and Ryan Kelly for the bulk of
this patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@10008 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/db/models/options.py

@@ -21,7 +21,7 @@ get_verbose_name = lambda class_name: re.sub('(((?<=[a-z])[A-Z])|([A-Z](?![A-Z]|
 DEFAULT_NAMES = ('verbose_name', 'db_table', 'ordering',
                  'unique_together', 'permissions', 'get_latest_by',
                  'order_with_respect_to', 'app_label', 'db_tablespace',
-                 'abstract')
+                 'abstract', 'managed')
 
 class Options(object):
     def __init__(self, meta, app_label=None):
@@ -42,6 +42,7 @@ class Options(object):
         self.pk = None
         self.has_auto_field, self.auto_field = False, None
         self.abstract = False
+        self.managed = True
         self.parents = SortedDict()
         self.duplicate_targets = {}
         # Managers that have been inherited from abstract base classes. These