#3 Patch to allow GraphView demo to fill window

[Trevor Harmon]

If you run the GraphView demo and then maximize the frame, the
component containing the graph won't expand, leaving large gaps of
whitespace that could be used for displaying more of the graph.

A single line of code can fix this problem. Just add the following to the
top of GraphView's constructor:

super(new BorderLayout());

[Jeffrey Heer]

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Added to code.