Qccl_translation_table, Qccl_translation_table_id): New variables.
append new symbols. Qccl_translation_table and
Qccl_translation_table_id.
(CCL_Call): Fix the comment.
(CCL_ReadMultibyteCharacter, CCL_WriteMultibyteCharacter,
CCL_UnifyCharacter, CCL_UnifyCharacterConstTbl,
CCL_IterateMultipleMap, CCL_TranslateMultipleMap): New macros for
CCL Commands.
(EXCMD): New macro.
(ccl_driver): New case lable `CCL_Extention'.
(setup_ccl_program): Initialize the member `private_state' of CCL.
(Fregister_ccl_program): Delete unused variable IDX.
(Fregister_ccl_translation_table): New function.
(syms_of_ccl): Intern and staticpro Qccl_program,
Qccl_translation_table, and Qccl_translation_table_id. Declare
`ccl-translation-table-vector' as a Lisp variable. Declare
register-ccl-translation-table as a Lisp function.
