OO-3473	: delete the temporary files only at the end of the wizard and not after the first created element

OO-3472: rewrite the delete routine to delete only the file of the edited checkbox, implement a check to not delete the file if it's used by an other checkbox

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