- Add Daijiten numbers.

- Add Daijiten numbers.
- Use `<-denotational@usage' instead of `<-denotational' for BUCS
  (super abstract) character objects.
(U+5B93-itaiji-001): New character.
(U-000219EE): Use `->denotational' and `->subsumptive'; add
`<-denotational@component' for A-IWDSU+219EE.
(U-00021A07): Likewise.
(U+5BCD-itaiji-002): New character.
(U-00021A5C): Add `<-denotational' for A-cgnU+21A5C.
(U+21A5C-var-002): New character; use `<-denotational' for U-00021A5C.
(U+21A5C-var-004): Likewise.
(U+21A5C-var-005): Likewise.
(A-cgnU+21A5C): New abstract node.
(U+21A5C-itaiji-003): New character; use `<-denotational' for
A-cgnU+21A5C.
(U-00021B0A): Use `->denotational' and `->subsumptive'.
(A-IWDSU+219EE): New abstract node.