* In Python 3 xlwt apparently does not support writing bytes values ->
try to decode assuming the value may be base64-encoded, this is more
or less the behaviour for CSV exports.
This will most likely not allow the export anyway as Excel cells are
limited to 32k data characters, which accounting for base64
expansion means ~24k worth of data, but that is a pre-existing
issue.
* Also removed support for way outdated browsers from
content_disposition: the Safari case is for Safari 5 (circa 2012)
but versioning apparently changed since then and modern Safari
report their "external" version number rather than the webkit
version number => the current Safari reports version 11, and gets
routed to the "does not support unicode file names", which is
further bugged in Python 3 as it %s's bytes, leading to a resulting
filename of e.g. `b'res.partner.csv'.csv` (with the prefix and
quotes).
* The IE case is for IE8, which has long been unsupported by the web
client.
Xavier Morel
b46830858f