Commented out setNodeName() methods of CanvasCellNode and CanvasCellEndNodes, and getPopupMenu() method of CanvasCellNode.
setNodeName() : decided to remove all node "edition" operations from CellNodes (delete node, rename node), becase it produces bugs in unsynchronization between CanvasNode-s and CanvasCellNode-s.
getPopupMenu() : before myDeleteItem was deactivated in CanvasCellNode, now it is not even added to CanvasNode's menu if the view_type is TABLE.
