Display-related functions implemented from scratch. Add toolkit
scroll bars, mouse-sensitive mode line, help-echo, busy-cursor. (x_calc_absolute_position): Subtract menu bar height for YNegative, if using X toolkit. (XTread_socket) [USE_MOTIF] <KeyPress>: Catch events in scroll bars. (SET_SAVED_MENU_EVENT): Give it statement form. (XTflash): Don't flash the toolbar window. (XTread_socket): Workaround for LessTif popup menus in case of ButtonPress events. (XTread_socket): Set inhibit_busy_cursor.
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