Updated the GB18030 converter (gb18030_mbtowc, gb18030_wctomb) to map 25 characters to code points that have been to Unicode since 2000, rather than to code points in the Private Use Area.
Updated the BIG5-HKSCS converter. The old BIG5-HKSCS converter is still available as BIG5-HKSCS:2004 (big5hkscs2004_mbtowc, big5hkscs2004_wctomb, big5hkscs2004_reset, normal_flushwc). A new converter BIG5-HKSCS:2008 is added (big5hkscs2008_mbtowc, big5hkscs2008_wctomb, big5hkscs2008_reset, normal_flushwc).
Fixed a small bug in the CP1258 converter (cp1258_mbtowc, cp1258_wctomb, normal_flushwc).
Added CP1131 converter (cp1131_mbtowc, cp1131_wctomb).
Added RK1048 converter (rk1048_mbtowc, rk1048_wctomb).
Upgraded EUC-KR (euc_kr_mbtowc, euc_kr_wctomb) and JOHAB (johab_mbtowc, johab_wctomb) to include the Korean postal code sign.