Remove remaining serialization-related code for ontologies

Make OntologyTermSimple serializable.

Author: arteymix

src/ubic/basecode/ontology/model/OntologyResource.java

@@ -19,7 +19,6 @@
 package ubic.basecode.ontology.model;
 
 import javax.annotation.Nullable;
-import java.io.Serializable;
 
 /**
  * @author pavlidis

src/ubic/basecode/ontology/model/OntologyTermSimple.java

@@ -15,6 +15,7 @@
 package ubic.basecode.ontology.model;
 
 import javax.annotation.Nullable;
+import java.io.Serializable;
 import java.util.Collection;
 import java.util.Comparator;
 import java.util.Objects;
@@ -25,8 +26,8 @@
  *
  * @author Paul
  */
-
-public class OntologyTermSimple implements OntologyTerm {
+@SuppressWarnings("unused")
+public class OntologyTermSimple implements OntologyTerm, Serializable {
 
     /**
      *