Force UTF-8 encoding of message in swirl_out to solve WINDOWS-1252 "umlaut" problem.

Adds a line, `Encoding(mes) <- "UTF-8"`, to `swirl_out` which forces the string, `mes`, to be interpreted as UTF-8 for printing. This overrides the default which, in Europe on Windows machines, can be the obsolete `WINDOWS-1252` encoding.