[Twisted-web] two XML-related fixes

[Stefano Debenedetti]

Hello, 

I just submitted a couple of patches to the Nevow issue tracker.

The first one [1] is to make flatsax.ToStan use the namespace prefix of elements that are not in the default namespace. I also added a new testcase for it.

The patch also fixes an already existing flatsax testcase which is now in TODO mode (test_switchns), at least as far as correct XML namespace usage is concerned, even if it would still fail because the input and output strings are not exactly the same. That testcase is probably superfluous if the new one gets checked in.

The second one [2] is a trivial change to the default 404 page so that it is wellformed XML.

Thanks, ciao
ste

[1] http://divmod.org/users/roundup.twistd/nevow/issue186
[2] http://divmod.org/users/roundup.twistd/nevow/issue187