code: function performDeleteAll(node,dialog,msg) {
  
      node.status({fill:'blue', shape:'dot', text:'requesting Delete All dialogs'});   
      dialog.getDialogs({}, function(err, dialogs){
        node.status({});
        if (err) {
            node.status({fill:'red', shape:'ring', text:'Delete All : call to getDialogs service failed'});
            node.error(err, msg);   
          } else {
            // Array to hold async tasks
            var asyncTasks = [];
            var nb_todelete = dialogs.dialogs.length;
            var nbdeleted = 0;
            dialogs.dialogs.forEach(function (aDialog) {
  
                asyncTasks.push(function (cb) {
                  var parms = {};
                  parms.dialog_id=aDialog.dialog_id;;
                  dialog.deleteDialog(parms, function(err, dialog_data){
                  node.status({});
                  if (err) {
                      node.error(err, msg);
                      console.log('Error with the removal of Dialog ID '+parms.dialog_id +' : ' +  err);
                    } else {
                      console.log('Dialog ID '+ aDialog.dialog_id + ' deleted successfully.');
                      nbdeleted++;
                    }
                    cb();
                  });  
                });
            });
  
          } // else
  
          async.parallel(asyncTasks, function(){
            // All tasks are done now
            console.log('Deleted ' + nbdeleted + ' dialog objects on ' + nb_todelete );
            if (nbdeleted==nb_todelete)
              msg.payload = 'All Dialogs have been deleted';
            else
              msg.payload = 'Some Dialogs could have not been deleted; See node-RED log for errors.';
            console.log(msg.payload);
            node.send(msg);            
          });
  
        });
    
      }
docs: This function performs the operation to Delete ALL Dialogs