(U+5915): Add S1-1544 and `hanyu-dazidian'.

(U+5915): Add S1-1544 and `hanyu-dazidian'.
(U+5916): Use `->subsumptive'.
(U+5918): Unify H3-AD64.
(U+5919): Add S1-1545 and `hanyu-dazidian'.
(U+591A): Add S1-1546 and `hanyu-dazidian'.
(U+591B): Add `<-denotational' for J97-546C; unify H3-ADC3.
(J97-546C): New abstract character.
(U+56F1): Copied from Ideograph-R031-Enclosure.el.
(C3-2548): Add `<-denotational' for U+56F1.
(U+591C): Use `->denotational' and `->subsumptive'.
(U+591D): Unify H3-ADC8.
(U+591F): Unify H3-ADD5.
(U+68A6): Add `ideographic-{radical|strokes}@{ucs|cns}' and
`ideographic-radical@{ucs|cns}*sources'.
(U+5921): Unify H3-ADEB.
(U+368A): Use `->subsumptive'.
(M-05801): Map to U-000215B4; unify H3-AE48.
(U-000215B4): Use `->subsumptive'.
(U+5922): Use `->denotational'.
(UU+5923): Unify H3-AE6B.
(U+5924): Use `->subsumptive'.
(U+368B): Use `->denotational'.
(U+5926): Use `->denotational' and `->subsumptive'.