[issue11588] Add "necessarily inclusive" groups to argparse

[paul j3]

paul j3 added the comment:

http://stackoverflow.com/questions/22929087
A question that could be addressed with this patch(es)

In a subparser:

    I have 4 arguments: -g, -wid, -w1, and -w2.

    -w1 and -w2 always appear together

    -wid and (-w1 -w2) are mutually exclusive, but one or the other is required

    -g is optional; if it is not specified only (-w1 -w2) can appear, but not -wid

The `g` case does not fit either the inclusive or exclusive group patterns.

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<http://bugs.python.org/issue11588>
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