(U+9F13): Add `<-denotational@usage' for BUCS+9F13 and A2-DJT-14775.

(U+9F13): Add `<-denotational@usage' for BUCS+9F13 and A2-DJT-14775.
(UU+9F13): Unify DJT-14775.
(U+9F13-var-004): New character; use `<-denotational' for U+9F13.
(U+9F15): Add `<-denotational@usage' for BUCS+9F15; apply new
conventions for glyph granularity.
(U+9F16): Add `<-denotational@usage' for A2-DJT-14781; apply new
conventions for glyph granularity.
(U-0002EBA7): New character.
(U-0002A517): Apply new conventions for glyph granularity.
(U-0002FA1B): Likewise.
(U+9F17): Add `<-denotational@usage' for BUCS+9F17; add
`sound@ja/on/{kan|go}'.
(UU+9F17): Add some relations for other characters.
(DJT-14782): New character; use `<-denotational' for U+9F17.
(HNG-KAR0468-0): Use `<-subsumptive' for DJT-14782 instead of
`<-denotational' for U+9F17.
(U-0002EBA8): New character.
(U+9F18): Apply new conventions for glyph granularity.
(U+9F1D): Likewise.
(U-0002A531): Likewise.
(U-0002EBAB): New character.
(U-0002A535): Apply new conventions for glyph granularity.
(U-0002A536): Likewise.
(BUCS+9F13): New abstract node.
(BUCS+9F15): New abstract node; unify A2-DJT-14777.
(A2-DJT-14781): New abstract node.
(BUCS+9F17): New abstract node; unify A2-DJT-14782.
(A2-DJT-14787): New abstract node.
(A2-DJT-14775): New abstract node; use `<-denotational' for BUCS+9F13.