Added: DidacticMaterialsManagerTests>>testNestedSelectByTitleContains, and DidacticMaterialsManagerTests>>testSimpleSelectByLicense. Modified setUp and tearDown accordingly.
Added FLOdacticFacade>>search: as SearchEngine>>filterByAuthor: (closure) and  SearchEngine>>addFilter: (proof of concept). Added missings initialize messages. Added tags and authors DidacticMaterial setters and getters.