S9 LIB  (make-help-index)  ==>  list

Return a comprehensive list of topics found in the online help
database. Topics include procedures (like CAR and +), syntactic
keywords (like IF and DEFINE) as well as special variables (such
as *LIBRARY-PATH*). The returned list will be lexicographically
sorted and free of duplicates.

(make-help-index)  ==>  (list of procedures and keywords)
