Fix a couple of file inclusion & autoload errors

request #5544: Fatal error on the widget my monitored forums
request #5554: Cannot select CSV preference in use prefs page
request #5545: can't access mediawiki

Change-Id: I50ea7c43a9bbe12461f277cd3c3498c3712fd46b
Merge commit 'refs/changes/25/1425/2' of http://gerrit.tuleap.net/tuleap into HEAD

* http://gerrit.tuleap.net/tuleap:
  Fix a couple of file inclusion & autoload errors

Change-Id: I604b53d08b349fb668fe2b0d355ba09806c6e2bc
This is Tuleap 6.6.99.34

Change-Id: Ib74d3a5a057fecdc9158c97e553abd9883c4f4b7