Don't require face.

Don't require face.
(quail): New group.
(quail-other-command): Dummy command to make quail-help works
better.
(quail-keyboard-layout-alist): Add Keyboard type "jp106".
(quail-keyboard-layout-substitution): New variable.
(quail-update-keyboard-layout): New function.
(quail-keyboard-layout-type): New customizable variable.
(quail-set-keyboard-layout): Call quail-update-keyboard-layout.
(quail-keyboard-translate): Pay attention to
quail-keyboard-layout-substitution.
(quail-insert-kbd-layout): New function.
(quail-show-keyboard-layout): New function.
(quail-get-translation): If the definition is a vector of length
1, and the element is a string of lenght 1, return the character
in that string.
(quail-update-current-translations): Fix the case of
relative-index out of range.
(quail-build-decode-map, quail-insert-decode-map): New Functions.
(quail-help): Show keyboard layout by quail-insert-kbd-layout.
Show key sequences for all avairable characters.
(quail-help-insert-keymap-description): Don't show such verbose
key bindings as quail-self-insert-command.