[issue9350] add remove_argument_group to argparse

[hai shi]

hai shi <shihai1991 at 126.com> added the comment:

paul, raymond. Thanks for give me a quick answer:).
Looks raymond's reason is good enough, i just only consider this question from   
api completeness(as paul said) not from user case.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue9350>
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