[okfn-help] knowledgeforge.net trac problems fixed

[Rufus Pollock]

Ever since switching on modwsgi (for ckan.org) on the same machine as
modwsgi (for rest of knowledgeforge.net) we've been having weird
errors. Today I've reverted ckan.org to use modpython and, fingers
crossed, the issues have gone away.

Going forward we clearly need to switch knowledgeforge.net to modwsgi
(modpython is deprecated).

Rufus