Added UTF-8 support. If the current locale specifies UTF-8 encoding,
then all text output (trace data, screen snapshots, the Ascii
and ReadBuffer(Ascii) actions, etc.) will be UTF-8 encoded, and
all text input (arguments to the Key and String actions,
etc.) must be UTF-8 encoded.
In addition, the NVT-mode xterm/VT100 emulator will expect UTF-8.
NOTE: If you were were previously running s3270 in a
UTF-8 locale, this is an incompatible change.
To ensure the previous behavior, set your locale to C before
starting s3270.