Added some unit tests for the find_map_nmplp() routine.

dlib/test/CMakeLists.txt

@@ -38,6 +38,7 @@ set (tests
    empirical_kernel_map.cpp
    entropy_coder.cpp
    entropy_encoder_model.cpp
+   find_map_nmplp.cpp
    geometry.cpp
    graph.cpp
    hash.cpp

dlib/test/makefile

@@ -54,6 +54,7 @@ SRC += empirical_kernel_map.cpp
 SRC += entropy_coder.cpp
 SRC += entropy_encoder_model.cpp
 SRC += geometry.cpp
+SRC += find_map_nmplp.cpp
 SRC += graph.cpp
 SRC += hash.cpp
 SRC += hash_map.cpp