ManagedProperties is declared like this:
class ManagedProperties(with_metaclass(BasicMeta, BasicMeta)):
...
I.e. ManagedProperties has BasicMeta both as its metaclass and as its
superclass (so it is a metaclass itself).
What's the purpose of this construction?
I suspect we should separate the metaclass functionality into a separate
class (or class hierarchy), but it's quite possible that I'm overlooking
something.
(Once I know the purpose, I can analyze how it applies to subclasses
which have a similarly dual superclass-metaclass nature.)
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