Appends all values from deque b to a.


- V

- a (Deque<(Of <(<'V>)>)>)
- A Deque to change.
- b (Deque<(Of <(<'V>)>)>)
- Another Deque of compatible type to a.
- graph (IGraph)
- The graph containing the node containing the attribute which gets changed.
- owner (INode)
- The node containing the attribute which gets changed.
- attrType (AttributeType)
- The attribute type of the attribute which gets changed.

A truth value telling whether a was changed (i.e. b not empty)