minor: toString, remove warning

SVN: 22188

screening/source/java/ch/systemsx/cisd/openbis/plugin/screening/shared/basic/dto/WellReference.java

@@ -82,4 +82,10 @@ public class WellReference implements ISerializable
             return false;
         return true;
     }
+
+    @Override
+    public String toString()
+    {
+        return platePermId + wellLocation.toString();
+    }
 }
\ No newline at end of file

screening/source/java/ch/systemsx/cisd/openbis/plugin/screening/shared/basic/dto/WellSearchCriteria.java

@@ -472,7 +472,6 @@ public class WellSearchCriteria implements ISerializable
         private String analysisProcedureCodeOrNull;
 
         // GWT only
-        @SuppressWarnings("unused")
         private AnalysisProcedureCriteria()
         {
         }