Generate some repetitive WordStar code with macros

Generate some repetitive WordStar code with macros

* lisp/obsolete/ws-mode.el (ws-set-marker-0, ws-set-marker-1):
(ws-set-marker-2, ws-set-marker-3, ws-set-marker-4, ws-set-marker-5):
(ws-set-marker-6, ws-set-marker-7, ws-set-marker-8, ws-set-marker-9):
(ws-find-marker-0, ws-find-marker-1, ws-find-marker-2, ws-find-marker-3):
(ws-find-marker-4, ws-find-marker-5, ws-find-marker-6, ws-find-marker-7):
(ws-find-marker-8, ws-find-marker-9): Remove.
(ws-set-marker, ws-find-marker): New macros.  Use them.