Call the superclass method from a subclass method.
The superclass method is specified in the current method list,
and is called the next method.
If REPLACEMENT-ARGS is non-nil, then use them instead of
`eieio-generic-call-arglst'. The generic arg list are the
arguments passed in at the top level.
Use `next-method-p' to find out if there is a next method to call.