(abstract J0-3937): Use `=>jis-x0208' and `=>jis-x0213-1' instead of

(abstract J0-3937): Use `=>jis-x0208' and `=>jis-x0213-1' instead of
`=jis-x0208@1997'.
(B-B1DF): Unify J97-4855.
(U+665A): Use `->subsumptive' to separate representative nodes; unify
abstract JX1-753C.
(U-000231B6): Use `->denotational' instead of `->subsumptive'.
(abstract J0-5A70): Use `=>jis-x0208' and `=>jis-x0213-1' instead of
`=jis-x0208@1997'.
(U+6666): Likewise.
(U+66D9): Likewise.
(J90-3D6C): Use `<-simplified@JP/jis' instead of `<-simplified@JP' for
J78-3D6C.