| AddEdge | AddEdge add an edge from the vertex x to the vertex y, if it is not there.
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| AddVertex | AddVertex adds the vertex x, if it is not there.
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| Adjacent | Adjacent tests whether there is an edge from the vertex x to the vertex y.
An error is thrown if either x, or y do not exist. By definition of adjacent there
must exist an edge e, with value (x, y) in order for vertices x, and y to be
considered adjacent.
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| Connections | Connections lists all vertices y such that there is an edge from the vertex x to
the vertex y. An error is thrown if x does not exist.
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| GetVertexValue | GetVertexValue returns the value associated with the vertex x.
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| RemoveEdge | RemoveEdge removes the edge from the vertex x to the vertex y, if it is there.
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| RemoveVertex | RemoveVertex removes the vertex x, if it is there.
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| Vertices | Vertices returns the set of the vertices which comprise the dag.
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