…lect the change in rentbw_config_resource

…dvantage to very small rentals under particular situations (but still under the condition of utilization >= adjusted_utilization)

Also add calculated fee to the error message when it exceeds 
max_payment.

… are resonable dependent heavily on the attributes of the core token

…en under the scenario of utilization <= adjusted_utilization

…hould preserve the existing value (or use default when appropriate)

…pricing model to now also include a min_price

Note: Assuming min_price is 0, this new price model can be directly 
compared to the prior one. In fact, under that condition, max_price can 
be thought of as target_price * exponent.