* wl-summary.el (wl-summary-reply): Don't treat switch buffer here.

* wl-summary.el (wl-summary-reply): Don't treat switch buffer here.
(wl-summary-forward): Ditto.

* wl-vars.el (wl-draft-buffer-style): Added choice of keep and
function.
(wl-draft-buffer-style): New use option.

* wl-draft.el (wl-draft-create-buffer): Abolish argument `full'.
(wl-draft): Follow the change above.
(wl-draft-create-buffer): Use wl-draft-reply-buffer-style and
wl-draft-buffer-style.
(wl-user-agent-compose): Bind wl-draft-buffer-style with
switch-function.