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	calling everything else which might compile a regexp.

	* dired.c (Fdirectory_files): Properly GCPRO the strings while
	calling Fexpand_file_name and Fdirectory_file_name.

	dummy.

(keymap_panes): New arg enables
(single_keymap_panes): New arg enables.  Fill in its contents.
(list_of_panes, list_of_items): New arg enables.  Fill in contents.
(Fx_popup_menu): Pass enable and enable_list args.
(single_keymap_panes): Set enable flag to -1 if cmd definition is nil.

exceed 20, to be consistent with indent.c and xdisp.c.

(Qoverflow_error, Qunderflow_error): New vars.

Use Fcar, Fcdr when extracting from event, to check data types.

(redisplay_window): Call display_menu_bar.

(menu_bar_items): New function.
(menu_bar_one_keymap, menu_bar_item): New functions.
(make_lispy_event): Handle menu bar events.
(read_key_sequence): Make dummy prefix `menu-bar' for menu bar events.

(struct frame): New field menu_bar_items.

(FRAME_MENU_BAR_LINES): New macro (two versions).
(struct frame): New field menu_bar_lines.

(enum x_frame_parm): Likewise.
(x_set_menu_bar_lines, x_set_menu_bar_lines_1): New functions.
(x_set_visibility): New function.
(Fx_create_frame): Handle menu-bar-lines parm.
(x_report_frame_params): Report Qvisibility.
(syms_of_xfns): Set up Qvisibility.

(single_keymap_panes): Test menu-enable property of symbol
to decide whether to include it in the menu.

(enum x_frame_parm): Likewise.
(x_set_menu_bar_lines, x_set_menu_bar_lines_1): New functions.
(x_set_visibility): New function.
(Fx_create_frame): Handle menu-bar-lines parm.
(Fframe_parameters): Report menu-bar-lines parm.
(syms_of_frame): Set up Qmenu_bar_lines.

	appeared in X11R4; for earlier versions, just access the members
	of the Display directly.

	we can't test HAVE_X11R4 to see how we should get the resource
	manager string; cheat.

	Use a "for (;;)" loop at the end of the function, to indicate that
	all exiting is taken care of inside the loop.
	(Fremove_text_properties): Same.

	variable under USG 5-4.

	* emacs.c (fatal_error_signal): Unblock the signal which we're
	handling using sigunblock.