- added storePosition() method to save the XY positions of nodes in the dataset.
- added storePosition() method to save the XY positions of nodes in the dataset.
- seperated allowedToMove into allowedToMoveX and allowedToMoveY. This is required for initializing nodes from hierarchical layouts after storePosition().
- seperated allowedToMove into allowedToMoveX and allowedToMoveY. This is required for initializing nodes from hierarchical layouts after storePosition().