Use `->subsumptive' or `{<-|->}denotational' for some character

Use `->subsumptive' or `{<-|->}denotational' for some character
definitions.
(U-000233B3): Use `->subsumptive'.
(C5-2148): Unify BC-8948.
(U-000233C2): Use `->subsumptive'; integrate BC-8CBA.
(U+6740): Use `=>daikanwa' instead of `morohashi-daikanwa' for
M-14471.
(U+6852): Use `->subsumptive'.
(U-0002F8E1): Add `<-denotational' for U+6852.
(U+688E): Integrate U-0002F8E4; move C5-327E under a child node of
U-0002F8E4.
(U+3B8B): Use `->subsumptive'; integrate M-15080.
(U+3B91): Use `->subsumptive'; integrate M-15103.
(U+3B95): Use `->subsumptive'; integrate M-15127.
(C5-3F71): Unify U-0002F8E7 and M-15187.
(U-00023583): Use `->subsumptive'; integrate M-15205.
(U-000235B4): Use `->subsumptive'; integrate M-15267.