Refactor to use #next_node_if

also added #response_is_only predicate
Refactor to use #next_node_if
Refactor to use #next_node_if
Refactor to use #next_node_if

also took advantage of next_node_calculation to simplify some of the
logic/calculations. Changed the text of the
outcome_age_limit_reached_payment outcome to use a more semantically
meaningful variable name.
Refactor to use #next_node_if
Refactor to use #next_node_if
Refactor to use #next_node_if