Add some mappings between CNS 11643-6 and CJK Ext-B code points.

Add some mappings between CNS 11643-6 and CJK Ext-B code points.
(U+45AA): Use `->subsumptive'; use
`{ideographic|total}-strokes@{daikanwa|cns}'.
(M-32972): Don't relate with U+86CA; use `->subsumptive' to integrate
H7-F7E5.
(U+86CA): Unify M-32974 instead of M-32972.
(U+8723): Use `->denotational' instead of `->subsumptive'.
(parent of M-33217): Unify U-00027351; delete `<-denotational' for
U+8744; add `<-unknown' for U+8744 instead.
(U+8746): Use `->denotational' instead of `->subsumptive'.
(U-00027388): Use `->denotational'.
(U+8747): Use `->denotational'.
(C6-6178): Map to U-0002733B and M-49685.
(U-00027380): New character; add `ideographic-strokes@daikanwa'; it
may be a mistake.
(M-33350): Use `<-subsumptive' for U-00027380.
(C6-6177): Likewise.