Local undi-structure for an edge. This structure contains basic
information for an edge of an undi_graph class object.
In particular, it contains:
1 - a non-negative integer identifier for the edge;
2 - a 'source' extremal node of the edge;
3 - a 'target' extremal node of the edge;
4 - a 'start' extremal node of the edge, if the edge is directed
(if the edge is not directed, this field is equal to NULL_EDGE);
5 - pointers at the positions of the edge in the different adjacent
lists;
6 - a list of all markers of the edge;
7 - a list of all constraints involving the edge.

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