Local undi-structure for a node. This structure contains basic
information for a node of an undi_graph class object.
In particular, it contains:
1 - a non-negative integer identifier for the node;
2 - the counterclockwise circular list of the incident incoming edges;
3 - the counterclockwise circular list of the incident outgoing edges;
4 - the counterclockwise circular list of all incident edges;
5 - a list of all markers of the node;
6 - a list of all constraints involving the node.
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