* poe-18.el (defalias): Remove its definition as a function and

* poe-18.el (defalias): Remove its definition as a function and
define it as an alias for `fset'.
(auto-fill-function): Declare with defvar-maybe.
(unread-command-event): Ditto.
(unread-command-events): Ditto.
(insert-and-inherit): Defile with defalias.
(insert-before-markers-and-inherit): Ditto.
(number-to-string): Ditto.