refactoring: GWT beans do not need any setters or getters

...nt/web/client/dto/DisplayedOrSelectedDatasetCriteria.java

...t/web/client/dto/DisplayedOrSelectedIdHolderCriteria.java

...is/generic/client/web/client/dto/TableModelReference.java

...generic/shared/basic/dto/DatastoreServiceDescription.java

.../cisd/openbis/generic/shared/basic/dto/DateTableCell.java

...cisd/openbis/generic/shared/basic/dto/ImageTableCell.java

...isd/openbis/generic/shared/basic/dto/NumberTableCell.java

...isd/openbis/generic/shared/basic/dto/StringTableCell.java

...msx/cisd/openbis/generic/shared/basic/dto/TableModel.java

.../cisd/openbis/generic/shared/basic/dto/TableModelRow.java