(M-18520): Use `<-denotational' for U+701E; use `<-vulgar*sources'

(M-18520): Use `<-denotational' for U+701E; use `<-vulgar*sources'
instead of char-ref in `<-vulgar'.
(J90-4654): Separate U+701E; use `<-denotational' for U+701E; use
`->subsumptive' to integrate U-0002F914; use `=>daikanwa' instead of
`morohashi-daikanwa'.
(U+701E): Define as an abstract character.
(J78-4654): Use `<-denotational' for U+701E; use `->subsumptive' to
integrate C3-5A52.