Test the new phi output

src/feature_creation/feature_space/FeatureSpace.cpp

.../operator_nodes/allowed_operator_nodes/cbrt/cube_root.cpp

...node/operator_nodes/allowed_operator_nodes/div/divide.cpp

src/feature_creation/node/utils.cpp

src/python/py_binding_cpp_def/bindings_docstring_keyed.cpp

...thon/py_binding_cpp_def/feature_creation/FeatureSpace.cpp

tests/exec_test/default/feature_space/phi.out

tests/exec_test/default/sisso.json

...feature_creation/test_feature_space/test_feature_space.py