(A-U+6BB3-itaiji-002): New abstract node.

(A-U+6BB3-itaiji-002): New abstract node.
(U+6BB3-itaiji-002): New character; use `<-denotational' for
A-U+6BB3-itaiji-002.
(A-compU+23A90): New abstract node.
(U-00023A90): Add `<-denotational' for A-compU+23A90; add
`sound@ja/on/{kan|go}'.
(IU+23A90): Add some relations for other characters.
(U+23A90-itaiji-001): New character; use `<-denotational' for
A-compU+23A90.
(U-00023ABE): Add `sound@ja/on/{kan|go}'.
(IU+23ABE): Unify MJ038933 and KOSEKI-189200; add `<-formed' and
`<-same' for IU+23A90.
(IU+23AD0): Add `<-formed' for IU+23A90.