Allow course owner to enter curriculum management site (with reduced
permissions), add configuration in type and element to aggregate the
lecture statistics, add three levels of details about lectures (list of
users, list for a specific user with all courses, details of a user in a
course)

OO-983: implements images for catalog, with crop tool, remove dependency to o'reilly servlet library, refactor calendar upload to use the standard FileElement (FlexiForm), use Base64 encoder of XStream (unit tested against infinispan encode, can after use the impl of JDK 8)...