The name of projects on readthedocs should have dashes, and not underscores. Their server was not redirecting properly from the / URL to the en/latest URL (a problem they will address later). So, the user manual was renamed from kotti_user_manual to kotti-user-manual, and rebuilt, and our links updated.
Merge pull request #223 from geojeff/user_manual_link

The name of projects on readthedocs should have dashes, and not undersco...