nvi i18n

[yamt%mwd.biglobe.ne.jp@localhost (YAMAMOTO Takashi)]

hi,

nozaki-san and i had a look at src/dist/nvi.

- it seems to assume 24-bit wchar_t. (ie. <= 0xffffff)
  it won't work with some of our locales like ja_JP.ISO2022-JP and
  zh_CN.GB18030 which use the whole 32-bit.

- cursor position sometimes get incorrect when using japanese characters.
  it's likely a wcurses problem than nvi itself because, according to
  nozaki-san, it works fine with ncurses.

- it seems to expect users to know raw wchar_t values for <control-X>.
  it isn't desirable as our wchar_t is an opaque type.

YAMAMOTO Takashi