(A-cgnU+52D2): New abstract node.

(A-cgnU+52D2): New abstract node.
(U+52D2): Add `<-denotational' for A-cgnU+52D2; add
`<-denotational@usage' for BUCS+52D2; apply new conventions for glyph
granularity.
(DJT-00885): New character; use `<-denotational' for U+52D2.
(A-U+52D2-itaiji-001): New abstract node; use `<-denotational' for
A-cgnU+52D2; use `<-denotational@usage' for BUCS+52D2.
(U+52D2-itaiji-001): New character; use `<-denotational' for
A-U+52D2-itaiji-001.
(HNG-KHI0277-0): Use `<-subsumptive' for g2-U+52D2-itaiji-001 instead
of `<-denotational' for U+52D2.
(BUCS+52D2): New abstract node; unify A2-DJT-00885.