extendet the test an implementation of numerical_function_from_expression. It now checks that the arguments of lambdify refer to free symbols.
extendet the test an implementation of numerical_function_from_expression. It now checks that the arguments of lambdify refer to free symbols.

MPIBGC-TEE/CompartmentalSystems,MPIBGC-TEE/CompartmentalSystems,MPIBGC-TEE/CompartmentalSystems