This very simple block allows a more flexible possibility in
outputing HTML content to users in a course.
The bloc allows outputing distinct content for any group setup
in the course.
The bloc has a "match all" case being printed first, and allows
also giving an extra information to people being "out of groups"
The Moodle 2.x versions are the result of the French state level project "ENTLibre 2.0" Of the National Funding program "Investissement d'Avenir"