(A-cgnU+61D0): New abstract node.

(A-cgnU+61D0): New abstract node.
(U+61D0): Add `<-denotational' for A-cgnU+61D0; add
`<-denotational@usage' for BUCS+61F7; apply new conventions for glyph
granularity.
(HNG-KHI0374-0): Use A-cgnU+61D0 instead of U+61D0 as its mother.
(A-MJ057525): New abstract node; use `<-denotational' for A-cgnU+61D0.
(MJ057525): Use A-MJ057525 instead of U+61D0 as its mother; add
`ideographic-structure'; unify DJT-03507.
(U+61F7): Add `<-denotational@usage' for BUCS+61F7; apply new
conventions for glyph granularity.
(BUCS+61F7): New abstract node; unify A2-DJT-03585.