[issue11174] add argparse formatting option to display type names for metavar

[paul j3]

paul j3 added the comment:

This formatter produces an error if one or more of the arguments uses the default `None` type (a string).   This is because `None` does not have a `.__name__`.

This HelpFormatter probably has been rarely, if ever, used.  The metavar parameter works just as well.

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nosy: +paul.j3

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<http://bugs.python.org/issue11174>
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