* wl-thread.el (wl-thread-update-line-msgs): Added optional argument `no-msg'.

* wl-thread.el (wl-thread-update-line-msgs): Added optional argument `no-msg'.
* wl-summary.el (wl-summary-delete-messages-on-buffer): Set no-msg
argument of `wl-thread-update-line-msgs'.
(wl-summary-set-parent): Added optional argument `parent-number'.
(wl-summary-buffer-saved-message): New buffer local variable.
(wl-summary-save-current-message): New command.
(wl-summary-yank-saved-message): Ditto.
(wl-summary-mode-map): Added key binding for `wl-summary-save-current-message'
(\ew) and `wl-summary-yank-saved-message' (\C-y).