(U+37AA): Apply new conventions for glyph granularity.

(U+37AA): Apply new conventions for glyph granularity.
(A-U+21D8D-itaiji-001): Unify A-U+21D8D-itaiji-002 and
A-U+21D8D-itaiji-003.
(U+21D8D-itaiji-002): New character; use `<-denotational' for
A-U+21D8D-itaiji-001.
(U+21D8D-itaiji-003): Ditto.
(U+5CF1): Add `<-denotational@usage' for A2-DJT-02590; modify
structure; apply new conventions for glyph granularity.
(U+5CFB): Add `<-denotational@usage' for BUCS+5CFB; apply new
conventions for glyph granularity.
(U-00021EB2): Apply new conventions for glyph granularity.
(U+5DA9): Add `<-denotational@usage' for A2-DJT-02590.
(U+5DCD): Add `<-denotational@usage' for BUCS+5DCD.
(HNG-KAR0793-0): Use `ideographic-structure@apparent' instead of
`ideographic-structure'.
(A2-DJT-02590): New abstract node.
(BUCS+5CFB): New abstract node; unify A2-DJT-02598.
(BUCS+5DCD): New abstract node; unify A2-DJT-02752.