#35: Enhance checking unique name of Location and Provider
#32: Changed response status and added message about existing element in the database
#36: Fixed 'ProviderServiceIT'
#36: Fixed 'DtoFactoryServiceIT'
#37: Course and Provider: Fix location setting during update
#36: Fixed 'CourseImportServiceIT'
#36: Fixed 'CourseImportServiceIT'
#36: Fixed 'CallLogControllerIT'
#36: Fixed 'TreeViewControllerIT'
#35: Fixed unique alert messages, refactored code
#35: Changed misleading LOG classes, refactored LocationController
Bumped mtraining version to 0.24-r2
Added digit-only check for number inputs
Fixed creating new chapter with preset quiz
Added possibility to clear quiz from the chapter
Disabled obsolete course configuration upload
Fixed version incrementing twice when both structure and state are modified
Fix for MDS DetachedFieldAccessException when resetting course progress
Added possibility to clear course location
Fixed input displaying old value when clearing quiz from the chapter