The original fix introduced a safety mechanism for avoiding transmission of invalid binary data via
XML-RPC, but caused an issue for binary function fields that do not carry data as base64.
This patch fixes this problem with the printing of odt/sxw reports (via odt2odt) which does
rely on non-base64 binary data for the sxw content.
By re-decoding the unicode-wrapped binary data using the pass-through charset latin1 we
are sure to restore the original byte values, hence the original file content.
bzr revid: odo@openerp.com-20110104115419-fa4pv1dc63f83dxi
15c38f45df