[v2] Node Checker for the new (v2) AST

[teofr]

Added a node checker for the new AST (#1493), it defines a trait to be implemented over the new nodes.

An important note, I use V1 nodes rather than a cursor since it's easier to track what I've seen and what I haven't seen. I found it difficult with a cursor to keep track of the children of a given node that had been processed already, and to traverse them in an arbitrary order. Since this comparison mechanism is temporary I think this solution is ok, but it does mean all the offset calculation is being done again.

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