Use `<-denotational@usage' instead of `<-denotational' for BUCS.

Use `<-denotational@usage' instead of `<-denotational' for BUCS.
(A-IWDSU+5203): Omit `<-denotational@usage'.
(U+5203): Add `<-denotational@usage' for BUCS+5203; apply new
conventions for glyph granularity.
(U+5204): Add `<-denotational@usage' for BUCS+5203.
(U+5205): Use `<-denotational@usage' instead of `<-denotational' for
BUCS+5275; add A2-DJT-00733 as a target of `<-denotational@usage';
apply new conventions for glyph granularity.
(U-0003011D): New character.
(U+5259): Add ideographic-structure.
(U+5270): Likewise.
(U-0002D0F6): New character.
(U-0002D0F8): Apply new conventions for glyph granularity.
(U-0002D0F9): Add `total-strokes'.
(hanaJU+2D0F9): Add `ideographic-radical', `ideographic-strokes' and
`total-strokes'.
(U+5269): Apply new conventions for glyph granularity.
(BUCS+5203): Unify A2-DJT-00732.
(A2-DJT-00733): New abstract node.
(BUCS+5231): New abstract node; unify A2-DJT-00771.
(BUCS+5269): Unify A2-DJT-00814.