(A-IWDSU+6C92): Omit '<-denotational@usage'.

(A-IWDSU+6C92): Omit '<-denotational@usage'.
(U+6C92): Add `<-denotational@usage' fir BUCS+6C92.
(UU+6C92): Unify DJT-06023.
(U+6CA1): Add `<-denotational@usage' fir BUCS+6C92.
(MJ015161): Unify DJT-06022.
(U-00023D2C): Add `sound@ja/on'.
(IU+23D2C): Unify MJ039296 and KOSEKI-198400; add `<-original' for
UU+6C92.
(U+6DAF): Add `<-denotational@usage' for BUCS+6DAF; apply new
conventions for glyph granularity.
(U+6EB0): Add `<-denotational@usage' for BUCS+769A; apply new
conventions for glyph granularity.
(U+6F04): Apply new conventions for glyph granularity.
(BUCS+6C92): Unify A2-DJT-06023.
(BUCS+6DAF): New abstract node; unify A2-DJT-06218.