Delete dead code in CoordItem

CoordItem has quite large blocks of code which are never executed, e.g.

Click to expand

                /////////////////////////////////////////////////////
                // Draw a cube (Quader) near coord system          //
                /////////////////////////////////////////////////////

                bool drawCube = false;

                if(drawCube)
                {
                    painter->setPen(Qt::green);
                    // Boden
                    p[0] = extCalib->getImagePoint(cv::Point3f(100, 100, 0));
                    p[1] = extCalib->getImagePoint(cv::Point3f(200, 100, 0));
                    painter->drawLine(QPointF(p[0].x, p[0].y), QPointF(p[1].x, p[1].y));
                    p[0] = extCalib->getImagePoint(cv::Point3f(200, 100, 0));
                    p[1] = extCalib->getImagePoint(cv::Point3f(200, 200, 0));
                    painter->drawLine(QPointF(p[0].x, p[0].y), QPointF(p[1].x, p[1].y));
                    p[0] = extCalib->getImagePoint(cv::Point3f(200, 200, 0));
                    p[1] = extCalib->getImagePoint(cv::Point3f(100, 200, 0));
                    painter->drawLine(QPointF(p[0].x, p[0].y), QPointF(p[1].x, p[1].y));
                    p[0] = extCalib->getImagePoint(cv::Point3f(100, 200, 0));
                    p[1] = extCalib->getImagePoint(cv::Point3f(100, 100, 0));
                    painter->drawLine(QPointF(p[0].x, p[0].y), QPointF(p[1].x, p[1].y));
                    // Seiten
                    p[0] = extCalib->getImagePoint(cv::Point3f(100, 100, 0));
                    p[1] = extCalib->getImagePoint(cv::Point3f(100, 100, 100));
                    painter->drawLine(QPointF(p[0].x, p[0].y), QPointF(p[1].x, p[1].y));
                    p[0] = extCalib->getImagePoint(cv::Point3f(200, 100, 0));
                    p[1] = extCalib->getImagePoint(cv::Point3f(200, 100, 100));
                    painter->drawLine(QPointF(p[0].x, p[0].y), QPointF(p[1].x, p[1].y));
                    p[0] = extCalib->getImagePoint(cv::Point3f(100, 200, 0));
                    p[1] = extCalib->getImagePoint(cv::Point3f(100, 200, 100));
                    painter->drawLine(QPointF(p[0].x, p[0].y), QPointF(p[1].x, p[1].y));
                    p[0] = extCalib->getImagePoint(cv::Point3f(200, 200, 0));
                    p[1] = extCalib->getImagePoint(cv::Point3f(200, 200, 100));
                    painter->drawLine(QPointF(p[0].x, p[0].y), QPointF(p[1].x, p[1].y));
                    // Oben
                    p[0] = extCalib->getImagePoint(cv::Point3f(100, 100, 100));
                    p[1] = extCalib->getImagePoint(cv::Point3f(200, 100, 100));
                    painter->drawLine(QPointF(p[0].x, p[0].y), QPointF(p[1].x, p[1].y));
                    p[0] = extCalib->getImagePoint(cv::Point3f(200, 100, 100));
                    p[1] = extCalib->getImagePoint(cv::Point3f(200, 200, 100));
                    painter->drawLine(QPointF(p[0].x, p[0].y), QPointF(p[1].x, p[1].y));
                    p[0] = extCalib->getImagePoint(cv::Point3f(200, 200, 100));
                    p[1] = extCalib->getImagePoint(cv::Point3f(100, 200, 100));
                    painter->drawLine(QPointF(p[0].x, p[0].y), QPointF(p[1].x, p[1].y));
                    p[0] = extCalib->getImagePoint(cv::Point3f(100, 200, 100));
                    p[1] = extCalib->getImagePoint(cv::Point3f(100, 100, 100));
                    painter->drawLine(QPointF(p[0].x, p[0].y), QPointF(p[1].x, p[1].y));
                }

They are mostly not hard to write again and make the current code hard to read. Therefore I propose deleting them.