Whoops, forgot to actually add Container files to last commit, but this is the purely virtual Container class from which MObject and Scene now derive

container/__init__.py

@@ -0,0 +1 @@
+from container import *

container/container.py

@@ -0,0 +1,21 @@
+from helpers import *
+
+# Currently, this is only used by both Scene and MOBject.
+# Still, we abstract its functionality here, albeit purely nominally.
+# All actual implementation has to be handled by derived classes for now.
+#
+# Note that although the prototypical instances add and remove MObjects, 
+# there is also the possibility to add ContinualAnimations to Scenes. Thus, 
+# in the Container class in general, we do not make any presumptions about 
+# what types of objects may be added; this is again dependent on the specific
+# derived instance.
+
+class Container(object):
+    def __init__(self, *submobjects, **kwargs):
+        digest_config(self, kwargs)
+
+    def add(self, *items):
+    	raise Exception("Container.add is not implemented; it is up to derived classes to implement")
+
+    def remove(self, *items):
+    	raise Exception("Container.remove is not implemented; it is up to derived classes to implement")