(abstract J0-6726): Use `=>jis-x0208' and `=>jis-x0213-1' instead of

(abstract J0-6726): Use `=>jis-x0208' and `=>jis-x0213-1' instead of
`=jis-x0208@1997'.
(B-B2E6): Unify abstract J0-4326.
(U+8171): Unify abstract J0-6727.
(J0-6727): Separate JX3-6727.
(G0-6B6C): Unify JX3-6727.
(J78-425C): Unify JX3-425C.
(J90-425C): Separate JX3-425C; add `<-simplified@JP/extra' for
J78-425C.
(U+818E): Use `->denotational' and `->subsumptive'.
(U-000267AD): Use `->subsumptive'.
(U+818F): Unify abstract J0-3951.
(K0-4D47): Separate J0-3951 and JX1-3951.
(abstract glyph of GT-38767): Use `=>>gt' instead of `<=>gt'.
(abstract glyph of GT-38769): Ditto.