test/graph_test.cc added.
It discovered several bugs and warnings in 'include/smart_graph.h',
in 'include/skeletons/graph.h' and in 'work/alpar/list_graph.h'.
They have also been fixed.
1 BINARIES = kruskal_test ma_order_test
2 INCLUDEDIRS= -I. -I.. -I../../include -I../{marci,jacint,alpar,klao,akos}