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(hol_entry_help): Print the right documentation string for each entry.
(argp_help): Renamed from argp_usage.
(make_hol): Deal with a null value of OPT. If there are no entries, don't
define the ENTRIES or SHORT_OPTIONS fields.
(hol_free): Don't free ENTRIES or SHORT_OPTIONS unless there are any.
(hol_sort): Don't sort unless there are some entries.
(hol_usage): Don't do anything unless there are some entries.
(hol_sort): Sort int he correct order.
(hol_append): Implement.
(argp_help): Add the ARGP_HELP_SHORT_USAGE case.
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