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Squash of:
- including children in topologies_test.go
- report.Node.Prune should prune children also
- rewrote ShortLivedInternetConnections test to express its intent
- adding tests for detail Summary rendering

report/node.go

@@ -219,8 +219,13 @@ func (n Node) Merge(other Node) Node {
 // for rendering nodes and edges stripped away. Specifically, that means
 // cutting out parts of the Node.
 func (n Node) Prune() Node {
+	prunedChildren := MakeNodeSet()
+	n.Children.ForEach(func(child Node) {
+		prunedChildren = prunedChildren.Add(child.Prune())
+	})
 	return MakeNode().
 		WithID(n.ID).
 		WithTopology(n.Topology).
-		WithAdjacent(n.Adjacency.Copy()...)
+		WithAdjacent(n.Adjacency.Copy()...).
+		WithChildren(prunedChildren)
 }