VMM/{Account,common,maillocation}: Dovecot version (check) fixes. - Account: fixed versions dependencies. - maillocation: use the version string, may be uses in a error message. - common: version_hex() raises a ValueError, instead of returning 0, if the version string is invalid.

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

MISSING_ARGS = 1
UNKNOWN_COMMAND = 2
USER_INTERRUPT = 3