Service/DAO: removed Evento stuff from service- and DAO layer, should rather be isolated in EventoSync package
EventoSync: new ConflictReport class
Controller: added EventoSync to Controller
--amend
Model: EventoAppointment: fixed roomIdList annotations
Model: added EventoCourse class as workaround, because JPA does not allow simple mapping scenarios, e.g. secondary tables joined with a column different than the primary key column