Added unit tests for the new graph cuts tools.

dlib/test/CMakeLists.txt

@@ -45,6 +45,7 @@ set (tests
    find_max_factor_graph_viterbi.cpp
    geometry.cpp
    graph.cpp
+   graph_cuts.cpp
    hash.cpp
    hash_map.cpp
    hash_set.cpp

dlib/test/makefile

@@ -60,6 +60,7 @@ SRC += find_max_factor_graph_nmplp.cpp
 SRC += find_max_factor_graph_viterbi.cpp
 SRC += geometry.cpp
 SRC += graph.cpp
+SRC += graph_cuts.cpp
 SRC += hash.cpp
 SRC += hash_map.cpp
 SRC += hash_set.cpp