(U+70CB): Add `<-denotational@usage' for BUCS+70CB; apply new

(U+70CB): Add `<-denotational@usage' for BUCS+70CB; apply new
conventions for glyph granularity.
(U+70DF): Add `sound@ja/on'.
(UU+70DF): Add some relations for other characters.
(U+7121): Apply new conventions for glyph granularity.
(U+7155): Likewise.
(U+7199): Likewise.
(U+7166): Likewise; add `<-denotational@usage' for BUCS+7166.
(U-000242F3): Add ideographic-structure; add `sound@ja/on'.
(IU+242F3): Add some relations for other characters.
(U+71D5): Add `<-denotational@usage' for BUCS+71D5; modify structure;
apply new conventions for glyph granularity.
(A-HD-TK01055690): New abstract node; use `<-denotational' for
A-cgnU+71D5.
(A-MJ058005): Likewise.
(HD-TK01055690): Use A-HD-TK01055690 instead of A-cgnU+71D5 as its
mother.
(MJ058005): Use A-MJ058005 instead of A-cgnU+71D5 as its mother.
(U+3DFC): Apply new conventions for glyph granularity.
(U+3DFA): New character.
(BUCS+70CB): New abstract node; unify A2-DJT-06833.
(BUCS+7166): New abstract node; unify A2-DJT-06917.
(BUCS+71D5): New abstract node; unify A2-DJT-06981.