Don't bind keys in quail-mode-map. The

Don't bind keys in quail-mode-map.  The
function added to quail-mode-hook turn ethio-mode on only when
input method "ethiopic" is begin used.
(ethio-prefer-ascii-space): Moved to lisp/language/ethio-util.el.
(ethio-toggle-space): Likewise.
(ethio-insert-space): Likewise.
(ethio-insert-ethio-space): Likewise.
(ethio-prefer-ascii-punctuation): Likewise.
(ethio-toggle-punctuation): Likewise.
(ethio-gemination): Likewise.
("ethiopic"): Doc-string of this Quail package modified.  Bind
function keys for TRANSLATION-KEYMAP to
quail-execute-non-quail-command.