message: Add examples as tests
diff: -cmake_minimum_required(VERSION 2.6)
  project(Coxeter_triangulation_example)
  add_executable ( Coxeter_triangulation_manifold_tracing_flat_torus_with_boundary_example manifold_tracing_flat_torus_with_boundary.cpp )
  -add_executable ( Coxeter_triangulation_manifold_tracing_custom_function_example manifold_tracing_custom_function.cpp )
  -
  if (TBB_FOUND)
  target_link_libraries(Coxeter_triangulation_manifold_tracing_flat_torus_with_boundary_example ${TBB_LIBRARIES})
  +endif()
  +add_test(NAME Coxeter_triangulation_manifold_tracing_flat_torus_with_boundary_example
  + COMMAND $<TARGET_FILE:Coxeter_triangulation_manifold_tracing_flat_torus_with_boundary_example>)
  +
  +add_executable ( Coxeter_triangulation_manifold_tracing_custom_function_example manifold_tracing_custom_function.cpp )
  +if (TBB_FOUND)
  target_link_libraries(Coxeter_triangulation_manifold_tracing_custom_function_example ${TBB_LIBRARIES})
  endif()
  +add_test(NAME Coxeter_triangulation_manifold_tracing_custom_function_example
  + COMMAND $<TARGET_FILE:Coxeter_triangulation_manifold_tracing_custom_function_example>)
  