Add an entry in the help list
ok = add_help_chapter(title,path[,mode])
String array, Help chapter title
String array, Help chapters path
A boolean, if TRUE, the chapter is considered as belongs to a internal modules, otherwise, the chapter is added as external module. It is an optional input argument and its default value is %F.
A vector of booleans. The same size as the
pathvariable. If the chapter page number i was not existing in the help system then ok(i) is set to %t.
This function adds a new entry in the help list. If the path is already present
in the help list,
add_help_chapter skips the add. The function
checks if the directory exist.