OO-449: remove all surviving @Transactional, add unit tests in groups to test them, add a missing view in IM, add unit tests to check it...

OO-449: with the changes of cache implementation, refactor the cache to have 1 unique cache and not a cache / course

OO-549: move the error message in the main controller instead of the contact controller to prevent popup in popup

OO-553: improve "StringHelper.transformDisplayNameToFileSystemName" to remove more special characters and all non-ascii characters in general

FXOLAT-208,OO-425: fixed changed location of tree-node-loading class and changed return value open method within FunctionalCourseUtil. Implemented some utility methods.

OO-347: add CSS class for details of a repository entry and more log by deployment of courses via the REST API

FXOLAT-208,OO-425,OO-548,OO-550: Set more pessimistic timing limits in FunctionalUtil and enhanced XPath selector in FunctionalRepositorySiteUtil and created some skeletons.

no-jira: remove very dummy test, activate my tests for the merge of the entity manager spring <-> openolat