21948: EDF SMESH : Memory is not freed when deleting a mesh

21948: EDF SMESH : Memory is not freed when deleting a mesh

-  Observer_i(_PTR(Study) aStudyDS, SalomeApp_Study* aStudy)
+  Observer_i(_PTR(Study) aStudyDS, SalomeApp_Study* aStudy):QObject(aStudy)
   {

 SalomeApp_Study::~SalomeApp_Study()
 {
+  if ( myObserver ) {
+    PortableServer::ObjectId_var oid = myObserver->_default_POA()->servant_to_id( myObserver );
+    myObserver->_default_POA()->deactivate_object( oid.in() );
+  }
}