clean up qdebug's in JigsawSetupDialog::validateSigmaTables()

   */

  void JigsawSetupDialog::validateSigmaTables() {

    bool tablesAreValid = true;

    // Evaluate both tables; if any value is invalid, the table is invalid

    const QTableWidget *positionTable = m_ui->positionAprioriSigmaTable;

    qDebug() << "validating the position table...";

    qDebug() << "\tnumber of rows: " << positionTable->rowCount();

    for (int i = 0; i < positionTable->rowCount(); i++) {

      qDebug() << "\t\trow " << i;

      const QTableWidgetItem *item = positionTable->item(i,3);

      qDebug() << "\t\titem: " << item;

      qDebug() << "\t\tdata: ";

      if (item) { 

        qDebug() << item->data(Qt::UserRole);

        if (item->data(Qt::UserRole).toBool() == false) {

          tablesAreValid = false;

          break;

        }

      }

      else qDebug() << "(null)";

    }

    m_ui->okCloseButtonBox->button(QDialogButtonBox::Ok)->setEnabled(tablesAreValid);