Add mappings between CJK Ext B and CNS 11643 plain 7.

Add mappings between CJK Ext B and CNS 11643 plain 7.
(RUI6-E066): New character.
(U-0002784B): Use `->subsumptive' to separate representative nodes.
(U-0002785A): New character.
(U-0002785C): New character.
(U-0002785F): New character.
(C7-3B67): Integrate U-00027867 and M-34903.
(U+4689): Use `->subsumptive' to separate representative nodes.
(U+468A): Use `->denotational' instead of `->subsumptive'.
(C7-3B6A): Unify U-0002787B and M-34939.
(U+468C): Use `->subsumptive' to separate representative nodes.
(U-00027882): Use `->denotational' instead of `->subsumptive'.
(U+4693): Use `->denotational' to separate representative nodes.
(U-0002789E): Use `->denotational' instead of `->subsumptive'.
(U-000278AA): New character.
(U-0002F9CB): Use `<-same@ucs*note' instead of `<-same@ucs*notes'.