(U-00023B41): Add `<-denotational@usage' for A2-DJT-05857; use

(U-00023B41): Add `<-denotational@usage' for A2-DJT-05857; use
`->denotational' and `->subsumptive'.
(U-0002DBD6): New character.
(A-U+2DBD6-itaiji-001): New abstract node.
(U+2DBD6-itaiji-001): New character; use `<-denotational' for
A-U+2DBD6-itaiji-001.
(U+3C9C): Add `<-denotational@usage' for A2-DJT-05871; use
`->subsumptive'.
(U+3CAD): Add `<-denotational@usage' for A2-DJT-05871; use
`->subsumptive'.
(U-00023C31): New character.
(A2-DJT-05857): New abstract node.
(A2-DJT-05871): New abstract node.