VMM: moved functions ace2idna(), check_domainname(), idn2ascii() and relevant parts to the Domain module. Adjusted imports in modules AliasDomain, EmailAddress and Handler.

# -*- coding: UTF-8 -*-
# Copyright (c) 2007 - 2010, Pascal Volk
# See COPYING for distribution information.

MISSING_ARGS = 1
UNKNOWN_COMMAND = 2
USER_INTERRUPT = 3