(U+4FC1): Add A2-DJT-00322 as a target of `<-denotational@usage';

apply new conventions for glyph granularity.
(U+4FE3): Add BUCS+6A35 as a target of `<-denotational@usage'; apply
new conventions for glyph granularity; subsume
CHISE-HDIC-KTB-0487[1_051_A11] and CHISE-HDIC-TSJ-06B4 [s0129a503].
(U+3481): Add `<-denotational@usage' for A2-DJT-00480.
(UU+3481): Unify DJT-00480.
(BUCS+4FC1): Unify A2-DJT-00322.
(BUCS+4FE3): New abstract node; unify A2-DJT-00348.
(A2-DJT-00480): New abstract node.