LMS-2566 using file abstraction

...ch/systemsx/cisd/common/io/ByteArrayBasedContentNode.java

...stemsx/cisd/common/io/ConcatenatedContentInputStream.java

...java/ch/systemsx/cisd/common/io/FileBasedContentNode.java

...a/ch/systemsx/cisd/common/io/HDF5DataSetBasedContent.java

.../HierarchicalContentNodeBasedHierarchicalContentNode.java

common/source/java/ch/systemsx/cisd/common/io/IContent.java

...rce/java/ch/systemsx/cisd/common/io/IContentProvider.java

...al_content/HDF5ContainerBasedHierarchicalContentNode.java

...io/hierarchical_content/HierarchicalNodeBasedContent.java

...sx/cisd/common/io/ConcatenatedContentInputStreamTest.java

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

...sd/openbis/dss/generic/server/DataSetCommandExecutor.java

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

...enbis/dss/generic/server/DatasetImageOverviewServlet.java

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

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

...enbis/dss/generic/server/IDatasetImageOverviewPlugin.java

...sd/openbis/dss/generic/server/ProcessDatasetsCommand.java

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

...s/dss/generic/server/plugins/demo/DemoOverviewPlugin.java