(A-IWDSU+51E1): New abstract node; unify IWDS1-55346.

(A-IWDSU+51E1): New abstract node; unify IWDS1-55346.
(IWDS1-0055): Unify A-IWDSU+5342 instead of A-compU+5342; add
`<-denotational@component' for IWDS1-55346.
(A-compU+5342): New abstract node.
(U+5342): Add `<-denotational' for A-compU+5342.
(A-UU+5342): Abolished; use A-IWDSU+5342 as different abstract node.
(UU+5342): Use U+5342 instead of A-UU+5342 as its mother.
(CU+5342): Likewise.
(BC-88EC): Likewise.
(CB07314): Likewise.
(U+5342-itaiji-001): Use A-compU+5342 instead of U+5342 as its mother.