Add QAspectRatioLayout borrowed from http://wiki.forum.nokia.com/index.php/CS001309_-_Maintaining_square_form_for_a_widget_in_Qt to maintain width == height * 2 aspect ratio for map drawing widget

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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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}