Added:
. IMObjectBean:
   IMObjectReference getNodeSourceObjectRef(String node, boolean active);
   IMObjectReference getNodeTargetObjectRef(String node, boolean active);
. EntityBean:
  IMObjectRelationship addNodeTarget(String name, IMObjectReference target);


git-svn-id: svn://svn.openvpms.org/openvpms/framework/branches/1.8-dev@5985 9e4fa352-aafb-0310-9071-df624684024b