Implemented Spring transactions into code and tests.
Equals overloaded for DPU and TemplateConfiguration.
DPU is not cascade-persisted from DPUInstance.
Pipeline cannot be lazyloaded from PipelineExecution, because
OpenSessionInView paradigm is not used.
Added missing @JoinColumn to PipelineExecution (reference to Pipeline).
Added @Transactional annotations to facades.
Merge branch 'master' of github.com:mff-uk/intlib