Use a signal to connect to a slot in main window.

Coding style fixes.

http://gitorious.org/keepassx/keepassx/merge_requests/10

src/main.cpp

@@ -51,9 +51,10 @@ int main(int argc, char** argv)
     }
 
     MainWindow mainWindow;
-    app.setMainWindow(&mainWindow);
     mainWindow.show();
 
+    QObject::connect(&app, SIGNAL(openDatabase(QString)), &mainWindow, SLOT(openDatabase(QString)));
+
     if (!filename.isEmpty()) {
         mainWindow.openDatabase(filename, password, QString());
     }