OO-2057: adapt the course element for the new binder, the assessment tool to view the details of the new binder and the binder resource
enable floating entries with ownership
OO-2052: remove group memberships first to prevent timing issue with the asynchronous removing of subscription (patch S. Clemenz)
OO-2057: add more panels in home with dummy contents, add file storage, add poster for binder and page...
OO-1593: convert hint from QTI 1.2, handle disabled math extension, better behavior of the dropdown tree in assessment tool...
no-jira: add alias in course xstream configuration of AttributeEndswithOperator for backwards compatibility with OLAT 7.8
