* emacs-lisp/byte-run.el (advertised-signature-table): New var.

* emacs-lisp/byte-run.el (advertised-signature-table): New var.
(set-advertised-calling-convention): New function.
(make-obsolete, define-obsolete-function-alias)
(make-obsolete-variable, define-obsolete-variable-alias):
Make the optional-ness of `when' obsolete.
(define-obsolete-face-alias): Make `when' non-optional.
* help-fns.el (help-function-arglist):
* emacs-lisp/bytecomp.el (byte-compile-fdefinition):
Use advertised-signature-table.