* [NOD-640] Revamp blueBlocksBetween to return up to maxEntries from highNode's antiFuture.
* [NOD-640] Fix bad traversal.
* [NOD-640] Use more accurate len.
* [NOD-640] Use more appropriate len in another place.
* [NOD-640] Remove the whole business with highNode's anticone.
* [NOD-640] Rename highNodeAntiFuture to candidateNodes.
* [NOD-640] Explain the highNode.blueScore-lowNode.blueScore+1 approximation.
* [NOD-640] UpHeap -> upHeap.
* [NOD-640] Fix off-by-one error.
* [NOD-640] Rename blueBlocksBetween to antiPastBetween,
* [NOD-640] upHeap -> up-heap.
* [NOD-640] Use a classic for to populate nodes.
* [NOD-640] Reworded a comment.
* [NOD-640] Clarify a comment.
* [NOD-640] Fix nodes declaration.