* mandos (AvahiService.__init__): Take new "protocol" parameter. All callers changed. (IPv6_TCPServer.__init__): Take new "use_ipv6" parameter. All callers changed. (IPv6_TCPServer.server_bind): Create IPv4 socket if not using IPv6. (main): New "--no-ipv6" command line option. New "use_ipv6" config option. * mandos-options.xml ([@id="address"]): Document conditional IPv4 address support. ([@id="ipv6"]): New paragraph. * mandos.conf (use_ipv6): New config option. * mandos.conf.xml (OPTIONS): Document new "use_dbus" option. (EXAMPLE): Changed to use IPv6 link-local address. Added "use_ipv6" option. * mandos.xml (SYNOPSIS): New "--no-ipv6" option. (OPTIONS): Document new "--no-ipv6" option.