(language-info-custom-alist): New.

(language-info-custom-alist): New.
(input-method-activate-hook, input-method-inactivate-hook)
(input-method-after-insert-chunk-hook)
(input-method-use-echo-area, set-language-environment-hook)
(exit-language-environment-hook): Customize.
(find-coding-systems-for-charsets): Rewritten.
(default-input-method): Add :link.