message: Remove unnecessary namespace declarations
diff: #include <QMessageBox>
  #include <boost/lexical_cast.hpp>
  -using namespace std;
  -using namespace boost;
  MultiSendDialog::MultiSendDialog(QWidget* parent) : QDialog(parent, Qt::WindowSystemMenuHint | Qt::WindowTitleHint | Qt::WindowCloseButtonHint),
  ui(new Ui::MultiSendDialog),
  