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  The initial property value should be from the position preceding
  POSITION, not following it.

now passed to the function.  It now works properly.

order of priority.

overlay, use that overlay as the object in which the help was
found.

arguments: the pane number and selection number.

	additional arguments OBJECT and POS.

list, take one USER_DATA argument.
(foreach_window_1): Likewise, and call callback functions with two
args, the window and USER_DATA.
(struct check_window_data): New struct.
(check_window_containing): Use it.
(window_from_coordinates): Set up a struct check_window_data for
foreach_window.
(add_window_to_list, freeze_window_start): Change parameters
according to new calling convention.

unibyte string to multibyte if necessary.

(x_set_name): Use x_encode_text.
(x_set_title): Likewise.

on the same display, select that frame, instead of switching to
the Info buffer in another window of the selected frame.

kp-0 to kp-9 and kp-subtract.
(digit-argument): Handle these keys.

stuff -- irrelevant with overlays.  Put an extra property on the
overlays and use it to clean up in case goto-address is re-run.

free.

Record the object that generated the help echo and the position of
that object in help_echo_object and help_echo_pos.  Record that
some glyphs in a row are displayed in mouse-face.
(IT_update_begin): Don't clear mouse highlight unless one of the
enabled glyph rows is marked as being displayed in mouse-face.
(dos_rawgetc): Generate 2 events for HELP_EVENT.  Pass the object
and position recorded in help_echo_object and help_echo_pos to the
event queue.
(IT_menu_display): Accept a new argument PN: the pane number of
the current menu pane.  Record the pane number and the item
number of the item which has associated help string.
(XMenuActivate): Update the prototype for help_callback in
function declaration.  Call IT_menu_display with the current menu
pane number as an additional argument.  Call help_callback with
two additional arguments: the pane number and the item number of
the menu item associated with the help text.
(help_echo_object, help_echo_pos): New variables.
(syms_of_msdos): Initialize them and staticpro help_echo_object.
(help_echo_window): New variable.
(syms_of_msdos): Initialize and staticpro it.
(IT_note_mode_line_highlight): Set help_echo_window.
(IT_note_mouse_highlight): Ditto.
(dos_rawgetc): Store help_echo_window in the second event produced
for HELP_EVENTs.