public DependencyGraphFactory()
{
listeners = new ArrayList<GraphListener>();
taskFlagCyclicEdges = new FlagCyclicEdgesTask();
taskPopulateGraph = new PopulateGraphMasterTask();
taskReduceScope = new ReduceScopeTask( DependencyScope.TEST );
tasks = new ArrayList<GraphTask>();
/* Take the basic graph, and expand the nodes fully, including depman.