Graph and UndirGraph concept modifications.
* For incidence iterators ({In,Out,Inc}EdgeIt) there is now baseNode and
runningNode functions in graph interface
* For Edge in undir graphs: Edge(UndirGraph const &, UndirEdge, Node)
constructor. Same for IncEdgeIt
* Edge(UndirEdge, bool) constructor is no more in the public interface. (But we
need it in the developpers interface).
1 BINARIES = bfs_test min_cost_flow
2 INCLUDEDIRS= -I../.. -I.. -I../{athos,klao,marci,jacint,alpar,johanna,akos}