* xfns.c (x_icon): Don't call x_wm_set_icon_positions if the user

* xfns.c (x_icon): Don't call x_wm_set_icon_positions if the user
	hasn't specified the icon position.  Let the window manager put
	the icon where it likes.

	* xfns.c (x_set_name): Use XSetWM{Name,IconName} when available
	[HAVE_X11R4], or XSetIconName and XStoreName otherwise.

	* xfns.c: Use the FRAME_X_WINDOW for readability.

	* xfns.c (x_set_mouse_color): Use x_catch_errors, x_check_errors,
	and x_uncatch errors to avoid crashing if the user selects an
	odd cursor.

	* xfns.c (select_visual): Use XVisualIDFromVisual when available
	[HAVE_X11R4].