SP-45, BIS-21 Autorecovery - rollback stack modifications

...strator/AbstractOmniscientTopLevelDataSetRegistrator.java

...isd/etlserver/registrator/DataSetRegistrationService.java

.../etlserver/registrator/DataSetStorageRecoveryManager.java

...h/systemsx/cisd/etlserver/registrator/IRollbackStack.java

...ver/registrator/api/v1/impl/AbstractTransactionState.java

...gistrator/api/v1/impl/DataSetRegistrationTransaction.java

...cisd/etlserver/registrator/api/v1/impl/RollbackStack.java

...er/registrator/api/v2/JythonTopLevelDataSetHandlerV2.java

.../etlserver/registrator/api/v1/impl/RollbackStackTest.java