(U+52E4): Add `<-denotational@usage' for BUCS+52E4; add

(U+52E4): Add `<-denotational@usage' for BUCS+52E4; add
`ideographic-structure'.
(A-UU+52E4): New abstract node; use `<-denotational' for U+52E4.
(o-JU+52E4): Use A-UU+52E4 instead of U+52E4 as its mother.
(HNG-KHM0225-0): Likewise; add `ideographic-structure'.
(A-U+52E4-itaiji-003): New abstract node; use `<-denotational' for
U+52E4.
(U+52E4-itaiji-003): New character; use `<-denotational' for
A-U+52E4-itaiji-003.
(UU+52E4): Use A-UU+52E4 instead of U+52E4 as its mother; unify
U+FA34.
(g2-UU+52E4): Move U+FA34 to UU+52E4.
(BUCS+52E4): New abstract node; unify A2-DJT-00900.