Use `shuowen-tongxundingsheng' instead of `shuowen-tongxun-dingsheng'

Use `shuowen-tongxundingsheng' instead of `shuowen-tongxun-dingsheng'
as a source ID.
(U+3DB3): Add `<-denotational@usage' for A2-DJT-06834.
(UU+3DB3): Unify DJT-06834.
(U+7106): Apply new conventions for glyph granularity.
(U+7156): Add `<-denotational@usage' for BUCS+7156.
(JU+7156): Unify DJT-06899.
(U+721A): Add `<-denotational@usage' for A2-DJT-07016.
(UU+721A): Unify DJT-07016.
(A2-DJT-06834): New abstract node.
(BUCS+7156): New abstract node; unify A2-DJT-06899.
(A2-DJT-07016): New abstract node.