DatabaseAccess use
WrongType in DPUMessage fix
DPURecord work with DPUInstance instead od DPU
Record and RecordType rename to DPURecord, DPURecordType
Event update
Merge branch 'master' of https://github.com/mff-uk/intlib.git

Conflicts:
	backend/src/main/java/cz/cuni/xrg/intlib/backend/execution/Engine.java