* international/quail.el (quail-guidance-str)

* international/quail.el (quail-guidance-str)
(quail-guidance-frame): New variables.
(quail-guidance-win): Delete this variable.
(quail-setup-overlays): Make overlay not rear-advancing.
(quail-kill-guidance-buf): Delete this function.
(quail-activate): Add/remove quail-show-guidance to/from
post-command-hook.
(quail-input-method): Don't setup quail-guidance-buf.  Initialize
quail-guidance-str to "".
(quail-start-translation): Call quail-show-guidance at first.
(quail-start-conversion): Likewise.
(quail-terminate-translation): Don't erase quail-guidance-buf.
(quail-update-translation): Stretch overlays if their starting and
ending positions are same.
(quail-update-current-translations): Check the width of the
current window, not the width of quail-guidance-win.
(quail-make-guidance-frame): Delete the arg BUF.  Fix position
calculation.  Don't set the window buffer, just return the new
frame.
(quail-minibuffer-message): New function.
(quail-show-guidance): Renamed from quail-show-guidance-buf.  Use
message and quail-minibuffer-message to display the guidance.
(quail-hide-guidance): Renamed from quail-hide-guidance-buf.  Only
delete quail-guidance-frame.
(quail-update-guidance): Just update quail-guidance-str, not
display it.
(quail-get-translations): Renamed from quail-show-translations.
Return a string instead of inserting it in quail-guaidance-buf.