OO-1225: remove save button for single choice in restricted mode, hardened event loop in the controller, fix the same kind of issue in essay

OO-1192: don't revalidate already validated import text, add commit and close session in different place of the bulk import

OO-1159: a better fix to the issue with the resume as perfect solution is not possible without refactoring

OO-1159: don't use the course to update the efficiency statement, prevent nested doInSync to load the course

OO-1108: show very long range event where the begin is before the month shown by the calendar and the end date after

OO-1121: check if the event has an end date, update the calendar REST mapper to check if begin and end date exists