OO-3469: better check variable in velocity template, check if the candidate session exists in disposing phase

OO-3290: implement relation repository entry to curriculum elements (DB and UI), implement UI to manager user and role in curriculum elements

OO-3296: don't upgrade manager roles if administrator and decouple every role, remove double update roles method...

OO-3296: implement migration tool from institution resource manager to learn resource manager based on organizations

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