Alias.__init__(): Check really if the given address is not used.
# -*- coding: UTF-8 -*-# Copyright (c) 2007 - 2009, VEB IT# See COPYING for distribution information.AUTHOR='Pascal Volk <p.volk@veb-it.de>'RELDATE='2009-08-12'VERSION='0.5.1'__author__=AUTHOR__date__=RELDATE__version__=VERSION__all__=['__author__','__date__','__version__']