* FLIM-ELS: (flim-modules): Install mel-b-ccl.el for

* FLIM-ELS: (flim-modules): Install mel-b-ccl.el for
mule-2.3@19.34.

* mel-b-ccl.el (mel-ccl-decode-b): Check `ccl-cascading-read' to
select implementation.
(mel-ccl-encode-b): Use `define-long-ccl-program' to define.
(mel-ccl-encode-base64-crlf-crlf): Ditto.
(mel-ccl-encode-base64-crlf-lf): Ditto.