[devtools/testlib] Port CubicWebTC.view() to py3k testlib.TestCase.set_description's argument will eventually be printed out to sys.stdout/stderr. On python 2, this object takes bytes-like objects (eg, str) whereas python 3's takes unicode-like objects and handles the encoding on its own. Thus the 'str' type can used in both versions to eventually display the description on screen.

[devtools/testlib] port 'fake_form' test to io.BytesIO

[dataimport] port ucsvreader tests to io.BytesIO

[py3k] io.BytesIO

[py3k] io.StringIO

Port cw.Binary to io.BytesIO And add plenty of tests too!

[py3k] execfile → exec