(U+6B21): Add J97-3C21.

(U+6B21): Add J97-3C21.
(C6-2523): Map to U-0002F8EF.
(U+6B29): Fix `ideographic-strokes'.
(U-000238A7): Add `sound@ja/on'.
(C6-3857): Add `<-formed' for M-20272; add `<-same@yupian' for
M-16020.
(U+3C32): Use `->subsumptive'; integrate M-16092.
(U+3C33): Use `->subsumptive'; integrate M-16094.
(U-000238C8): Use `->subsumptive'; integrate M-16095.
(U+3C34): Use `->subsumptive'; integrate M-16096.
(U-000238C9): Use `->subsumptive'; integrate M-16098.
(U+3C35): Use `->subsumptive'; integrate M-16100.
(U-000238CA): Use `{ideographic|total}-strokes@cns' instead of
`{ideographic|total}-strokes'; add `{ideographic|total}-strokes@ucs'
and `ideographic-strokes@ucs*sources'.
(U+3C36): Use `->denotational' and `->subsumptive'.
(U-000238CF): Use `->subsumptive'.
(U-000238D0): Use `->subsumptive'; integrate M-16112.
(U-000238D1): Use `->subsumptive'; integrate M-16113.
(U-000238D2): Use `->subsumptive'; integrate M-16114.
(U-000238D3): Use `->subsumptive'; integrate M-16115.
(U-000238D5): Use `->subsumptive'; integrate M-16119.
(U-000238D6): Use `->denotational' and `->subsumptive'.
(C6-4A3F): Map to U-0002F8F0.