[CMake] clean: keep minimal required instructions

CMakeLists.txt

cmake

include/dynamic-graph/python/CMakeLists.txt

include/dynamic-graph/python/link-to-python.hh.in

src/CMakeLists.txt

src/dynamic_graph/CMakeLists.txt

src/interpreter.cc

tests/CMakeLists.txt

tests/custom_entity.cpp

tests/dynamic-graph-python-test.cc

tests/dynamic-graph-python-test.cpp

tests/dynamic-graph-python-test.hh

tests/interpreter-test-runfile.cc

tests/interpreter-test.cc

tests/main.cc

tests/test_bindings.py

tests/test_custom_entity.py

tests/test_python-name_error.py

tests/test_python-ok.py

tests/test_python-restart_interpreter.py