(U-00020A2D): Add `<-formed@flipped-horizontally' for U+4E2E.

(U-00020A2D): Add `<-formed@flipped-horizontally' for U+4E2E.
(A-IWDSU+20A40): New abstract node; use `<-denotational' for
A-cgnU+20A2D.
(U-00020A40): Use A-IWDSU+20A40 instead of A-cgnU+20A2D; add
`<-formed@flipped-horizontally' for U-000200E8.
(IU+20A40): Add `<-formed@flipped-horizontally' for IU+200E8.
(U-00020A49): Add `<-denotational' for A-IWDSU+20A40; apply new
conventions for glyph granularity.
(U+539C): Add `<-denotational@usage' for A2-DJT-01071; apply new
conventions for glyph granularity.
(U-00020AAA): Apply new conventions for glyph granularity.
(A2-DJT-01071): New abstract node.