(U+662F): Add `<-denotational@usage' for BUCS+662F and A2-DJT-04512;

(U+662F): Add `<-denotational@usage' for BUCS+662F and A2-DJT-04512;
add `ideographic-structure@apparent'; add `sound@ja/on/{kan|go}' and
`sound@ja/on/conventional'.
(UU+662F): Modify structure; add an apparent field based on the
previous structure; add some relations for other characters.
(U+6630): Add `<-denotational@usage' for BUCS+6630 and A2-DJT-04512;
modify structure; preserve the previous IDS as an apparent structure;
add `sound@ja/on'.
(UU+6630): Modify structure; preserve the previous IDS as an apparent
structure; add `<-ancient' for CU+590F; add `<-original' for UU+662F.
(U-0002319E): Apply new conventions for glyph granularity.
(A2-DJT-04512): New abstract node.
(BUCS+662F): New abstract node; use `<-denotational' for A2-DJT-04512.
(BUCS+6630): New abstract node; use `<-denotational' for A2-DJT-04512.