dot (GraphViz) formatted networks are always imported as directed

[Dimitris Kalamaras]

1. Save a file named test.dot with this undirected data inside:

 graph graphname {
     // This attribute applies to the graph itself
     size="1,1";
     // The label attribute can be used to change the label of a node
     a [label="Foo"];
     // Here, the node shape is changed.
     b [shape=box];
     // These edges both have different line properties
     a -- b -- c [color=blue];
     b -- d [style=dotted];
 }

2. Open the test.dot in SocNetV. The network is visualized as directed though in the file it was explicitly declared as "graph" not "digraph".