(U+3AD0): Apply new conventions for glyph granularity.

(U+3AD0): Apply new conventions for glyph granularity.
(U-00023146): Add `sound@ja/on'.
(IU+23146): Unify MJ037617 and KOSEKI-154610; add U+7A18 into
`<-ancient'; add `<-formed' for U+671F.
(U-00023173): Add `sound@ja/on'.
(IU+23173): Add `<-same' for U+6603.
(U+5192): Use `<-denotational@usage' instead of `<-denotational' for
BUCS+5192.
(U+663C): Add `<-denotational@usage' for A2-DJT-04542; unify
DJT-00040.
(U-000231F3): Apply new conventions for glyph granularity.
(A2-DJT-04542): New abstract node.