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hol_entry_first_short, hol_entry_first_long, hol_find_entry, hol_sort,
hol_entry_help, argp_hol, argp_args_usage, argp_doc, argp_help, argp_error):
Add `const' where appropriate.
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Correctly print group headers, and precede them with a blank line.
(struct hol_entry, make_hol, hol_sort, hol_set_group):
Rename the `set_class' field to be `group'.
(hol_help, hol_entry_help):
After a group header has been printed, separate subsequent groups with a
blank line.
(hol_set_group): Renamed from hol_set_sort_class.
(argp_help): Use hol_set_group instead of hol_set_sort_class.
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Use the new GROUP field in struct argp_option to initialize sort_classes.
(HEADER_COL): New macro.
(hol_entry_help): Deal with group headers.
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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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