(hol_find_entry): Don't increment ENTRY prematurely.

(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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