Qt: Remember the tile and font size

The QT_TILEWIDTH and QT_TILEHEIGHT read from NetHack config file
override the remembered settings.
Also set the smallest tile size to 6x6

win/Qt4/qt4main.cpp

@@ -490,6 +490,10 @@ NetHackQtMainWindow::NetHackQtMainWindow(NetHackQtKeyBuffer& ks) :
     addToolBar(toolbar);
     menubar = menuBar();
 
+    QCoreApplication::setOrganizationName("The NetHack DevTeam");
+    QCoreApplication::setOrganizationDomain("nethack.org");
+    QCoreApplication::setApplicationName("NetHack");
+
     setWindowTitle("Qt NetHack");
     if ( qt_compact_mode )
 	setWindowIcon(QIcon(QPixmap(nh_icon_small)));