[LMS-2276] cleanup & javadocs

...temsx/cisd/common/utilities/HierarchicalContentUtils.java

.../systemsx/cisd/openbis/dss/client/api/cli/CommandPut.java

.../systemsx/cisd/openbis/dss/client/api/v1/IDataSetDss.java

...msx/cisd/openbis/dss/client/api/v1/impl/DssComponent.java

...isd/openbis/dss/generic/server/AbstractDssServiceRpc.java

...enbis/dss/generic/server/api/v1/DssServiceRpcGeneric.java

...nbis/dss/generic/shared/api/v1/IDssServiceRpcGeneric.java

...cisd/openbis/dss/client/api/v1/impl/DssComponentTest.java

.../cisd/openbis/dss/generic/server/DssServiceRpcV1Test.java

.../openbis/dss/screening/server/DssServiceRpcScreening.java

...nbis/dss/screening/server/DssServiceRpcScreeningTest.java