Alist of NS options.
Each element has the form
(NAME NUMARGS HANDLER FRAME-PARAM VALUE)
where NAME is the option name string, NUMARGS is the number of arguments
that the option accepts, HANDLER is a function to call to handle the option.
FRAME-PARAM (optional) is the frame parameter this option specifies,
and VALUE is the value which is given to that frame parameter
(most options use the argument for this, so VALUE is not present).