OVT-8448: Added mass creation of new codeelement versions.
OVT-8464: Added error message when adding codes relation to self.
OVT-8464: Fixed tests.
Merge branch 'develop' of https://github.com/Opetushallitus/koodisto into develop
Simplified logging
OVT-8448: Added non flushing insert for CodeElement version creation. Moved Code element accepting logic to KoodiBusinessService and KoodiVersioDAO from koodistoBusinessService.
OVT-8448: Added flushmode COMMIT for mass operation getPreviousKoodiVersios.
Merge branch 'develop' of https://github.com/Opetushallitus/koodisto into develop