(U+5A04): Apply new conventions for glyph granularity.

(U+5A04): Apply new conventions for glyph granularity.
(A-cgnU+5A41): New abstract node; use `<-denotational' for BUCS+5A41.
(IWDS1-0348): Unify A-IWDSU+5A41 instead of A-compU+5A41; use
A-cgnU+5A41 instead of BUCS+5A41 as its mother.
(U+5A41): Add ideographic-structure.
(A-cgnU+21764): New abstract node; use `<-denotational' for
A-cgnU+5A41.
(C6-3E49): Unify U-00021764 instead of A-IWDSU+21764 and IU+21764; use
A-cgnU+21764 instead of U-00021764 as its mother.
(A-MJ057303): Use A-cgnU+21764 instead of U-00021764 as its mother;
use `->denotational' instead of `->subsumptive'; add
`ideographic-structure'.