(struct group): Add PARENT, PARENT_INDEX, HOOK, and CHILD_HOOKS fields.

(argp_parse):
  Add HOOK argument.
  Implement passing hook values to parsers, and propagating them between
    parents and children.
  When printing `too many arguments', test ARGP_NO_ERRS, not ARGP_NO_HELP.
(argp_default_options): Add --usage option.
(argp_default_parser):
  Use argp_state_help, so we don't need to screw with exit options anymore.
  Add usage option.

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