[issue17218] support title and description in argparse add_mutually_exclusive_group

[paul j3]

paul j3 added the comment:

oops - one more glitch (revealed by TestMutuallyExclusiveInGroup):

'add_mutually_exclusive_group' accepts a 'required' argument, but 'add_argument_group' does not.  So 'add_titled_mutually_exclusive_group' needs to be changed to temporarily remove that argument (if given).

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<http://bugs.python.org/issue17218>
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