(U-000225B6): Apply new conventions for glyph granularity.

(U-000225B6): Apply new conventions for glyph granularity.
(U+391F): Likewise.
(U+6050): Add `<-denotational@usage' for BUCS+6050; add
`sound@ja/on/{kan|go}'.
(UU+6050): Unify DJT-03272; add some relations for other characters.
(U-00022662): Apply new conventions for glyph granularity.
(U+6062): Likewise; add `<-denotational@usage' for BUCS+6062.
(U-00022677): Apply new conventions for glyph granularity.
(U+61B9): Likewise; add `<-denotational@usage' for A2-DJT-03536.
(BUCS+6050): New abstract node; unify A2-DJT-03272.
(BUCS+6062): New abstract node; unify A2-DJT-03284.
(A2-DJT-03536): New abstract node.