Add "Export database" to tablet menu

        android:id="@+id/menu_help"

        android:orderInCategory="6"

        android:title="@string/menu_help" />

    <item

        android:id="@+id/export_database"

        android:title="@string/menu_export_database"

        android:visible="false"

        android:showAsAction="never" />

</menu>