Convert some .el files to lexical scoping.
* bs.el (bs-refresh, bs-sort-buffer-interns-are-last)
(bs--get-marked-string, bs--get-modified-string)
(bs--get-readonly-string, bs--get-size-string, bs--get-name)
(bs--get-mode-name, bs--get-file-name): Mark unused arguments.
(bs--configuration-name-for-prefix-arg): Rename argument PREFIX-ARG.
* ehelp.el (electric-help-execute-extended)
(electric-help-ctrl-x-prefix):
* hexl.el (hexl-revert-buffer-function):
* linum.el (linum-after-change, linum-after-scroll):
* emacs-lisp/re-builder.el (reb-auto-update): Mark unused arguments.
* help-fns.el (help-describe-category-set): Remove unused ERR variable.