Improve and redesign test programs + unify their output (ticket #25)
- Move graph related utilities form test_tools.h to graph_test.h.
- Move the contents of graph_utils_test.h to graph_utils_test.cc.
- Rename map_test.h -> graph_maps_test.h.
- Rename digraph_test.h -> graph_test.h.
- Many improvements in the following files:
* digraph_test.cc
* graph_test.cc
* graph_test.h
* graph_maps_test.h
* graph_utils_test.cc
* bfs_test.cc
* dfs_test.cc
* counter_test.cc
- Test programs print messages only if it really seems necessary.
- Remove \file commands form .cc test files.

include_directories (${LEMON_SOURCE_DIR})

link_directories (${LEMON_BINARY_DIR}/lemon)

set (TESTS

  bfs_test

  counter_test

  dfs_test

  digraph_test

  dijkstra_test

  dim_test

  error_test

  graph_test

  graph_utils_test

  kruskal_test

  maps_test

  path_test

  random_test

  time_measure_test

  unionfind_test)

foreach (TEST_NAME ${TESTS})

  add_executable (${TEST_NAME} ${TEST_NAME}.cc)

  target_link_libraries (${TEST_NAME} lemon)

  add_test(${TEST_NAME} ${TEST_NAME})

endforeach (TEST_NAME)