Add some MJ code points.

Add some MJ code points.
(U+4F18): Apply new glyph-image conventions.
(U+4F9D): Likewise.
(U+4FDB): Likewise.
(U+4FF2): Likewise.
(U+506F): Likewise.
(UU+5091): Use `->subsumptive' to add representative nodes.
(U+509A): Apply new glyph-image conventions.
(U+50AC): Likewise.
(HD-KS012500): Use `->subsumptive' to add representative nodes.
(U+50EC): Apply new glyph-image conventions.
(AJ1-21164): Use `->subsumptive' to add representative nodes.
(U+3491): Apply new glyph-image conventions.
(U+50FB): Likewise.
(U+511B): Use `->subsumptive' instead of `->denotational'.
(A-HDU+512A): New node.
(U+512A): Add `<-denotational' for A-HDU+512A.
(HD-JT-ADB3): Use A-HDU+512A instead of U+512A as its mother.