[issue14386] Expose dictproxy as a public type

[STINNER Victor]

STINNER Victor <victor.stinner at gmail.com> added the comment:

> It's clutter and we should show some restraint before adding new types.

dictproxy() doesn't need to be a public builtin type. We can just implement its constructor without documenting the type. Or it may be exposed in a module like collections.

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<http://bugs.python.org/issue14386>
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