Add glyph-images of HNG-KHM.

Add glyph-images of HNG-KHM.
(A-MJ058863): New abstract node; add `<-denotational' for BUCS+9084.
(HNG-KHI0591-0): Use A-MJ058863 instead of BUCS+9084 as the mother;
use U+7758-itaiji-001 instead of U+7758-itaiji-003 in
`ideographic-structure'.
(MJ058863): New character; add `<-denotational' for A-MJ058863; unify
KOSEKI-443350.
(U+9000-var-002): New character to subsume HNG-KHI0583-0 and
HNG-KHM0544-0; add `<-denotational' for U+9000.
(MJ058857): Add `<-formed' for U+9060.
(CU+903A): Likewise.
(HNG-KHI0595-0): Use `<-subsumptive' for CU+903A instead of
`<-denotational' for U+903A.
(HNG-KHM0553-0): New character; add `<-denotational' for U+9047.
(A-MJ058856): New abstract character; add `<-denotational' for U+904E.
(MJ058856): New character; add `<-denotational' for A-MJ058856; unify
HD-KS441950.
(U+904E-itaiji-002): New character to subsume HNG-KHI0594-0 and
HNG-KHM0554-0; add `<-denotational' for A-MJ058856.
(U+9084): Separate A-UU+9084.
(A-UU+9084): Add `=>ucs@iwds-1'.
(A-MJ058868): New abstract character; add `<-denotational' for U+9084.
(HNG-KHM0546-0): New character; add `<-denotational' for A-MJ058868.
(MJ058868): Likewise; unify HD-KS444050.
(A-MJ060240): New abstract character; add `<-denotational' for U+908A.
(HNG-KHM0556-0): New character; add `<-denotational' for A-MJ060240.
(HD-TK01090430): Likewise.
(AJ1-14236): Use A-MJ060240 instead of U+908A as the mother; unify
MJ060240, HD-JT-BD45 and HD-TK01090290.
(MJ026207): New glyph-form; add `<-subsumptive' for MJ060240; unify
HD-JT-C0D6.