SetSubject
void SetSubject(const char* to,
SetSubject(mail->Subject());
void SetSubject(const char* subject);
fHeaderView->SetSubject(fMail->Subject());
fHeaderView->SetSubject(subject);
fHeaderView->SetSubject(string);
fHeaderView->SetSubject(fMail->Subject());
fMail->SetSubject(fHeaderView->Subject(), characterSetToUse,
fHeaderView->SetSubject(string);
reply->SetSubject(string.String());
message->SetSubject(subject.String());