We had incorrect number of POINTS passed (was 1, should be 2) and so
nodes circles weren't rendered properly.

* #471

of edges in graph

We are back to using original "sequences" package, it seems to work
OK (except the recursion error is still thrown, but that was also with
Data.Array).

However this doesn't work for large graphs still.

* #464

* #461

* #460

This reverts commit 8b67c94f.

* #448