test_web.py: relax tests for upload and mkdir forms to tolerate nondeterministic order of attributes.

Signed-off-by: David-Sarah Hopwood <david-sarah@jacaranda.org>
setup.py: add helpful comment on line that is a SyntaxError in Python < 2.6.

Signed-off-by: David-Sarah Hopwood <david-sarah@jacaranda.org>