Add a utility function buffer-narrowed-p, and use it.
* lisp/subr.el (buffer-narrowed-p): New function. * lisp/ses.el (ses-widen): * lisp/simple.el (count-words--buffer-message): * lisp/net/browse-url.el (browse-url-of-buffer): Use it * lisp/simple.el (count-words-region): Don't signal an error if there is a non-nil prefix arg and the mark is not set. * doc/lispref/positions.texi (Narrowing): Document buffer-narrowed-p.
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