create_options_manager
                        Create a hierarchical, mutable options manager
v_character_scalar      Validator for Character Scalar Values
v_enum                  Validator for Enumerated Character Values
v_logical_scalar        Validator for Logical Scalar Values
v_numeric_range         Validator for Numeric Values Within a Range
v_numeric_scalar        Validator for Numeric Scalar Values
v_numeric_vector        Validator for Numeric Vectors
v_xypair                Validator for XY Pair Lists
