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Update STATE.argp when adding a wrapper to implement the --help option.
In general, use the version of variables that are in STATE.
Update STATE.index in the case where getopt returns EOF.
Correctly translate options.
(argp_default_parser, argp_parse): Rename uses of argp_usage* to argp_help*.
(argp_parse):
Deal with null parser or option fields.
If an argp has neither a parser or any options, don't put it in GROUPS.
Use comparison with EGROUP, rather than testing the parser field, the end
test for iteration over GROUPS.
(argp_parse): Pass in the right value for GROUPS to convert_options.
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