disable opacity effect for non-linux as it is working only there, fix a glitch that would print the page for a frame and then animate it from another position, change the animation curve to something a little more speedy

#include <QtGui/QApplication>
#include "mainwindow.h"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();
    return a.exec();
}