Add glyph-images of HNG-KHI.

Add glyph-images of HNG-KHI.
(BUCS+9664): New abstract node.
(U+9664): Add `<-denotational' for BUCS+9664.
(HNG-KHI0606-0): New character; add `<-denotational' for BUCS+9664;
add `<-formed' for U+9664.
(HNG-KHI0608-0): New character; add `<-formed' for U+96A0, U+96B1 and
U-00028F06.
(BUCS+969B): New abstract node.
(U+969B): Use `->subsumptive'; add `<-denotational' for BUCS+969B.
(U+9645): Add `<-denotational' for BUCS+969B.
(HNG-KHI0205-0): New character; add `<-denotational' for BUCS+969B;
add `<-formed' for U+969B.
(U-00028F06): Apply new conventions for glyph granularity.