(quail-translation-keymap): Declare it as

(quail-translation-keymap): Declare it as
variable instead of constant.  Bind all keys less than 32 to
quail-other-command.  Don't bind the key meta-prefix-char and
escape.
(quail-simple-translation-keymap): Likewise.
(quail-conversion-keymap): Bind the key C-h to
quail-translation-keymap.
(quail-define-package): Fix typo in doc-string.
(quail-conversion-str): New variable.
(quail-input-method): Bind buffer-undo-list to t.  Show Quail
guidance buffer if necessary.
(quail-delete-region): Move the definintion before the first
calling place.
(quail-start-translation): Handle the case the arg KEY is nil.
Bind echo-keystrokes and help-char.  Initialize quail-current-str
to "".  If input-method-use-echo-area is non-nil, call
read-key-sequence with appropriate PROMPT arg.  Setup
last-command-event by local variable `keyseq'.  Generate an event
list form quail-current-str.  If input-methodd-exit-on-first-char
is non-nil, return only the first event.
(quail-start-conversion): Likewise.  Initialize
quail-conversion-str to "".  Generate an event list form
quail-conversion-str.
(quail-update-translation): Expect that the function given by
(quail-update-translation-function) returns a new control-flag.
Handle the case the length of quail-current-key is 1.  Use
string-as-unibyte if enable-multibyte-characters is nil.  Always
assures that quail-current-str is Lisp string.
(quail-self-insert-command): Use `or' instead of `unless'.
(quail-update-current-translations): Always assures that
quail-current-str is Lisp string.
(quail-next-translation-block): Update unread-command-events
correctly.
(quail-abort-translation): Set quail-current-str to nil.
(quail-conversion-delete-char): Update quail-conversion-str.
(quail-conversion-delete-tail): Likewise.
(quail-conversion-backward-delete-char): Likewise.
(quail-show-guidance-buf): Show Quail guidance buffer not in echo
area if input-method-use-echo-area is non-nil.
(quail-show-translations): Bind current-translations locally to
quail-current-translations to get this value across different
buffers.  Handle the case that the length quail-current-key is 0.
(quail-translation-help): If this command is invoked repeatedly,
scroll the already shown help window.  Handle the case that this
command is called while converting (not translating).
(quail-conversion-help):  This function deleted and the
functionality is merged to quail-translation-help.