Use `->subsumptive' or `{<-|->}denotational' for some character

definitions.
(U-00026657): Use `->subsumptive', `ideographic-radical@{ucs|cns}' and
`ideographic-radical@cns*sources' instead of `->identical' for
C4-2664.
(J0-4054): Add S1-6485.
(U-0002F984): New character.
(M-29639): Map to U-0002F984.
(C5-3B50): Likewise.
(J0-6734): Add S1-6556.