(parent of JX1-754E): Separate U-0002F8D8; add `=>>ucs@jis',

(parent of JX1-754E): Separate U-0002F8D8; add `=>>ucs@jis',
`=>>ucs@ks' and `=>>ucs@cns'.
(C4-323E): Unify U-0002F8D8.
(U+671B): Unify A-J0-4B3E.
(A-CU+671B): New abstract character.
(M-14368): Use A-CU+671B instead of U+671B as the value of
`<-denotational'.
(C1-5B2C): Likewise; unify CU+671B.
(parent of G0-4D7B): Separate U-0002F8D9; add `=>ucs@unicode',
`=>ucs@cns' and `=>gt'.
(C6-4058): Unify U-0002F8D9.