Automatically detect the character set of QWK-imported messages (that don't already have a FidoNet "CHRS" header) and create/set the FIDOCHARS header field accordingly (UTF-8, ASCII, or CP437). This should resolve the issue I observed of QWK-posted messages on FidoNet with the wrong CHRS header value (i.e. CP437, when the message body in fact contained UTF-8).