If the install script is run for a custom prefix (with --prefix), the config file path used by the install script is [prefix]/etc/pystata-kernel.conf. But then when the kernel is run and 'config.py' looks for a config file, it doesn't know what that custom prefix was. 'config.py' is only able to look in sys.prefix and the user's home directory. So there is no way for a config file saved to a custom prefix to be loaded, right?