LMS-1432 real lazy sections loading

...ent/web/client/application/AttachmentVersionsSection.java

...client/web/client/application/DisposableSectionPanel.java

...ric/client/web/client/application/ServerRequestQueue.java

...ric/client/web/client/application/SingleSectionPanel.java

...tion/framework/CompositeDatabaseModificationObserver.java

...ompositeDatabaseModificationObserverWithMainObserver.java

.../client/application/framework/DisplaySettingsManager.java

...b/client/application/ui/attachment/AttachmentBrowser.java

.../client/application/ui/data/AbstractExternalDataGrid.java

.../web/client/application/ui/data/DataSetSearchHitGrid.java

...nt/web/client/application/ui/data/RelatedDataSetGrid.java

...t/web/client/application/ui/grid/AbstractBrowserGrid.java

...t/web/client/application/ui/sample/SampleBrowserGrid.java

...eb/client/application/dataset/DataSetChildrenSection.java

...web/client/application/dataset/DataSetParentsSection.java

...lient/application/dataset/DataSetRelationshipBrowser.java

...lient/web/client/application/dataset/DataViewSection.java

...ient/application/experiment/ExperimentDataSetBrowser.java

...ient/application/experiment/ExperimentDataSetSection.java

...ent/application/experiment/ExperimentPropertiesPanel.java