2017-05-23  Stephen Berman  <Stephen.Berman@gmx.net>

	Fix and improve UI of scroll bar menu

        In addition, since the Emacs manual writes "scroll bar", "tool
	bar" and "menu bar", use this convention in the Show/Hide menues
	and tooltips as well.

	* lisp/menu-bar.el (menu-bar-showhide-scroll-bar-menu): Make
	pressing a radio button in the menu actually show that it was
	pressed.  Replace the two radio buttons to turn the horizontal
	scroll bar on and off with a single check-box toggle and add a
	separator between this and the vertical scroll bar radio
	buttons.
	(menu-bar-showhide-tool-bar-menu):
	(menu-bar-showhide-menu):
	(menu-bar-mode): Use conventional spelling.