Cleanup: fix code warnings.

...a/ch/systemsx/cisd/etlserver/plugins/SimpleShuffling.java

...strator/AbstractOmniscientTopLevelDataSetRegistrator.java

...server/registrator/JavaV2TestcaseRegistrationContext.java

...penbis/installer/izpack/OpenGettingStartedPageAction.java

...cisd/openbis/common/conversation/annotation/Progress.java

...erty_type/PropertyTypeListDeletionConfirmationDialog.java

...ation/ui/sample/SampleListDeletionConfirmationDialog.java

...c/client/web/client/application/ui/script/ScriptGrid.java

...business/bo/fetchoptions/datasetlister/DataSetLister.java

...a/ch/systemsx/cisd/openbis/generic/shared/dto/DataPE.java

...x/cisd/openbis/generic/shared/dto/DataStoreServicePE.java

.../ch/systemsx/cisd/openbis/generic/shared/dto/EventPE.java

...ystemsx/cisd/openbis/generic/shared/dto/ExperimentPE.java

.../systemsx/cisd/openbis/generic/shared/dto/MaterialPE.java

...ch/systemsx/cisd/openbis/generic/shared/dto/SamplePE.java

...lient/web/client/application/module/QueryBrowserGrid.java

...ystemsx/cisd/openbis/generic/server/CommonServerTest.java

...bis/generic/server/business/bo/PropertyValidatorTest.java

...cisd/openbis/generic/server/business/bo/ScriptBOTest.java

...neric/server/dataaccess/db/EntityPropertyTypeDAOTest.java