(U+53E5): Add `<-denotational@usage' for BUCS+53E5 and A2-DJT-01143;

(U+53E5): Add `<-denotational@usage' for BUCS+53E5 and A2-DJT-01143;
add `sound@ja/on/{kan|go}'; unify DJT-01143; add some relations for
other characters.
(A-IWDSU+5409): New abstract node [separated from A-J0-3548].
(A-J0-3548): Unify A-JU+5409 instead of A-IWDSU+5409; use A-IWDSU+5409
instead of BUCS+5409 as its mother.
(U+5409): Add `<-denotational@usage' for BUCS+5409.
(U-00020BB7): Likewise.
(A-cgnU+5468): Changed from U+5468.
(B-A950): Use A-cgnU+5468 instead of U+5468 as its mother; add
`<-denotational@usage' for BUCS+5468 and BUCS+9031; unify U+5468
instead of A-IWDSU+5468 and A-UU+5468; add ideographic-structure.
(U-0002F83F): Unify DJT-01235.
(U+5468-itaiji-001): Use A-cgnU+5468 instead of U+5468 as its mother;
add `<-denotational@usage' for BUCS+5468 and BUCS+9031; add
`ideographic-structure'.
(U+54BD): Add `<-denotational@usage' for BUCS+56A5 and BUCS+54BD;
apply new conventions for glyph granularity.
(U+5540): Add `<-denotational@usage' for BUCS+5540; apply new
conventions for glyph granularity.
(U+35B6): Add `sound@ja/on'.
(MJ000380): Add some relations for other characters.
(U+5586): Add `<-denotational@usage' for BUCS+54F2; add
`ideographic-structure'.
(UU+5586): Unify DJT-01396; apply new conventions for glyph
granularity.
(U+560A): Add `<-denotational@usage' for A2-DJT-01469; apply new
conventions for glyph granularity.
(U+564E): Add `sound@ja/on/{kan|go}'.
(UU+564E): Add some relations for other characters.
(hanaJU+2D2F5): Add `ideographic-structure'.
(U+56A5): Add `<-denotational@usage' for BUCS+56A5; add `sound@ja/on';
apply new conventions for glyph granularity.
(U+56D3): Add `<-denotational@usage' for BUCS+9F67 and A2-DJT-01601.
(A2-DJT-01143): New abstract node.
(BUCS+5409): Unify A2-DJT-01172.
(BUCS+5468): New abstract node; unify A2-DJT-01235.
(BUCS+56A5): New abstract node; unify A2-DJT-01567.
(BUCS+5540): New abstract node.
(BUCS+54F2): New abstract node; unify A2-DJT-01326.
(A2-DJT-01469): New abstract node.
(BUCS+53E5): New abstract node; use `<-denotational' for A2-DJT-01143.
(A2-DJT-01601): New abstract node; use `<-denotational' for BUCS+9F67.