(U+6291): Add `<-denotational@usage' for BUCS+6291; add

(U+6291): Add `<-denotational@usage' for BUCS+6291; add
`ideographic-structure'; add `<-vulgar' for U-0002244F.
(A-IWDSU+6295): New abstract node.
(U+6295): Add `<-denotational' for A-IWDSU+6295; add
`<-denotational@usage' for BUCS+6295; apply new conventions for glyph
granularity.
(U-0002D818): New character; use `<-denotational' for A-IWDSU+6295;
use `<-denotational@usage' for BUCS+6295.
(U-00022AF9): Use `->denotational' and `->subsumptive'.
(U-00022BAE): Apply new conventions for glyph granularity.
(BUCS+6291): New abstract node; unify A2-DJT-03704.
(BUCS+6295): New abstract node; unify A2-DJT-03708.