Enable ~/.hedgewars/Data (or platform equivalent) to override/extend pretty much everything in system Data dir. Obviously desyncing can occur, so this is at user's own risk. Should simplify map etc install. Needs testing.

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

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