(U-00020BC1): Use `<-denotational@usage' instead of `<-denotational'

(U-00020BC1): Use `<-denotational@usage' instead of `<-denotational'
for BUCS+8DB3; add `<-denotational' for A-cgnU+8DB3; add
`<-denotational@component' for A-IWDSU+8DB3.
(o-IU+20BC1): Use `->denotational' instead of `->subsumptive'.
(IU+20BC1): Unify MJ032133 and KOSEKI-038420.
(U+542F): Apply new conventions for glyph granularity.
(U+5553): Likewise.
(U+555F): Likewise.
(U+5554): Likewise.
(A-BC-8CA3): New abstract node; use `<-denotational' for
A-compU+20DAC; unify A-GT-K08778.
(BC-8CA3): Use A-BC-8CA3 instead of A-compU+20DAC as its mother; unify
GT-K08778.
(U-00020D82): New character.
(U-00020E04): Apply new conventions for glyph granularity.
(U-0002A894): Likewise.
(A-U+24566-itaiji-003): New abstract node.
(U+24566-itaiji-003): New character; use `<-denotational' for
A-U+24566-itaiji-003.
(U+569B): Apply new conventions for glyph granularity.
(U+56A2): Likewise.
(U+56B7): Likewise.
(U-00021126): Likewise.
(U+56CA): Likewise.