Merge missing JIS X 0208 code points.

Merge missing JIS X 0208 code points.
(J83-4749): Separate J90-4749; add `ideograph=' property for M-17427.
(J90-5E56): Separate J83-5E56.
(J78-5E56): Unify J83-5E56.
(J83-4F51): Separate C3-3C63 and J90-4F51.
(M-17944): Unify J78-3942.
(J83-3942): Separate J78-3942.
(M-18098): Separate J78-5E78, J83-5E78, K0-4D63, C1-693E and U+6EFE.
(M-18123): Separate J78-5E74, J83-5E74, J90-5E74, K0-4B49, C3-4764 and
U+6F11.
(M-18155): Separate J83-4E7A, C1-694E, J90-4E7A and U+6F23.
(J90-5F21): Separate J78-5F21 and J83-5F21.
(J78-4275): Separate G0-652A, J83-4275, C1-7429, J90-4275 and U+6FEF.
(J78-494E): Separate J83-494E and J90-494E.
(M-18784): Unify J78-4667.
(J83-4667): Separate J78-4667.
(J78-4B22): Separate J83-4B22 and J90-4B22; fix `ideographic-strokes';
delete `kangxi-strokes'.