default encoding on Japanese windows environment

[Tatsuro M. <tma...@ya...>]

We consider the case where there is no "set encoding xxxx" in GNUPLOT.INT and GNUTERM is not sprcified.
At start up, excution result of "show encoding"
Cygwin => default (Perhaps on Linux the same)
Windows (on Japanese env.) => sjis (ShiftJIS, old Japanese encording)
Windows (not Japanese env.) => I do not know

Now even on Windows standard text editor notepad.exe, default encoding is utf8 but not sjis.
Sjis encording is only for backward compatibility.

sjis being default encoding on windows on Japanese env. is better to be stopped.

Tatsuro