Add 大夫 (ㄉㄞˋ ㄈㄨ˙)
Add 大夫 (ㄉㄞˋ ㄈㄨ˙) as exception phrase
Print key in log
Update LOG_API
Update AUTHORS and NEWS
Remove chewing_cand_string_by_index

chewing_cand_string_by_index is superseded by
chewing_cand_string_by_index_static.