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

Add mappings between CJK Ext B and CNS 11643 plain 7.
(U+8EB6): Use `->subsumptive' to separate representative nodes.
(U+8EB7): Use `->subsumptive'.
(U+8EB8): Use `->subsumptive' to separate representative nodes.
(U+8EB9): Likewise.
(U+8EBA): Use `->denotational' and `->subsumptive'.
(U+8EBB): Use `->subsumptive' to separate representative nodes.
(U+8EBE): Use `->subsumptive'.
(U+483D): Use `->subsumptive' to separate representative nodes.
(U+483E): Likewise.
(U+8EC5): Use `->subsumptive'.
(U+4840): Use `->subsumptive' to separate representative nodes.
(U+8EC7): Likewise.
(U+4841): Use `->subsumptive'.