(A-cgnU+5470): New abstract node.

(A-cgnU+5470): New abstract node.
(U+5470): Add `<-denotational' for A-cgnU+5470; add
`ideographic-structure'.
(UU+5470): Delete `=>ucs@iwds-1'; use UU+6B64 instead of U+6B64 as a
component.
(HNG-KHI0027-0): Use A-cgnU+5470 instead of U+5470 as its mother; add
`ideographic-structure'.
(U-00020CEE): Apply new conventions for glyph granularity.
(A-U+20CEE-itaiji-001): New abstract node.
(U+20CEE-itaiji-001): New character; use `<-denotational' for
A-U+20CEE-itaiji-001.
(U+55AC): Add `sound@ja/on/kan' and `sound@ja/on/go'.
(UU+55AC): Add some relations for other characters.