SSDM-1366: datastore_server: merge feature branch 'data-set-sample' with trunk.

...systemsx/cisd/etlserver/DataSetRegistrationAlgorithm.java

...ce/java/ch/systemsx/cisd/etlserver/DataStrategyStore.java

...erver/entityregistration/SampleAndDataSetRegistrator.java

...sd/etlserver/plugins/TemplateBasedLinkNamingStrategy.java

...ch/systemsx/cisd/etlserver/plugins/grouping/Grouping.java

...postregistration/Hdf5CompressingPostRegistrationTask.java

...d/etlserver/registrator/api/v1/impl/DataSetImmutable.java

...d/etlserver/registrator/api/v2/impl/DataSetImmutable.java

...emsx/cisd/openbis/dss/generic/server/MetaDataBuilder.java

...msx/cisd/openbis/dss/generic/server/UploadingCommand.java

...ver/plugins/standard/AbstractDropboxProcessingPlugin.java

...andard/archiver/AbstractDataSetFileOperationsManager.java

...penbis/dss/generic/shared/ExperimentBasedShareFinder.java

...dss/generic/shared/IdentifierAttributeMappingManager.java

...ystemsx/cisd/etlserver/TransferredDataSetHandlerTest.java