Completely arbitrary tweaking of tunnel values (avoids a nil) - still needs smooth curves (probably a target dx/dy to aim for, and slow alterations) and taking less CPU. Also disable unused function in Highlander

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#include <QtGui/QApplication>

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#include "mainwindow.h"

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int main(int argc, char *argv[])

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{

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    QApplication a(argc, argv);

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    MainWindow w;

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    w.show();

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    return a.exec();

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}