OO-3296: restrain enrollment date the member of the course (direct member of course or via business groups)
OO-3296: implement inheritance of specific roles in an organization structure (user manager, learn resource manager)
OO-3303: Survey course node with configurations for executor and report viewer roles, surveys are always anonymous
OO-3459: same access rule for the export of repository entries as of courses, allow export of resource like QTI 2.1 without temporary files
OO-3457: only use the latest candidate session in the correction workflow and don't use a cached one
