- Merge some `hanyu-dazidian-vol', `hanyu-dazidian-page' and

- Merge some `hanyu-dazidian-vol', `hanyu-dazidian-page' and
  `hanyu-dazidian-char' properties.
- Add some `ideographic-structure' properties.
- Use char-spec instead of char-ref as operators in
  `ideographic-structure' properties.
(U+56D9): Unify BC-8DE5.
(M-04695): Unify BC-8668.
(M-04736): Separate C6-2F5C; delete `cns-total-strokes'.
(C6-2F5C): Unify BC-8870.
(M-04747): Separate C6-2A41.
(BC-876C): New character; relate to M-04747.
(M-04823): Unify BC-8559.
(U+5716): Use U+555A instead of BC-8BEB in `ideographic-structure'.
(C7-5321): Unify BC-856D.