rs_function and rb_function parameters raise warning message when specified

[benmsanderson]

Defining rs_function or rb_function in a call to CICEROSCM is functional, but raises a warning message implying that the parameter name is not valid.

cscm_dir=CICEROSCM({
"rs_function":make_rs_function_from_arrays(
[0.5, .2,.01,.01, .01],
[1.2679, 5.2528, 18.601, 68.736, 232.3],
)})

Parameter rs_function is not used. Please check if you have a typo