Do not remove modified config files
    
    Our config files in /etc/ were marked as %config(noreplace). This means that the
    would not be replaced on upgraded if local modifications have been made. But
    when we moved them to /usr/lib, they would be be renamed to .rpmsave, if they
    had local modifications. This is not what I expected, but what rpm apparently
    does. So we need to add them as %ghost to prevent the removal. This is probably
    for the better anyway.