rentbw additional changes

[arhag]

Change Description

Changes:

• More cleanup
• Fix name of configrentbw action wrapper type.
• Add defaults for rent_days (30 days), decay_secs (1 day), and exponent (2.0).
• Also added defaults for min_rent_price and target_price. Assuming a core symbol of symbol("SYS", 4), the default for min_rent_price would be 0.0100 SYS and the default for target_price would be 100,000,000.0000 SYS. (While included in this PR, this change was later removed from PR rentbw #397.)
• Include calculated rental fee in error message when max_payment is too low so that the user has an idea of how much the max_payment needs to be under current market conditions.
• Change rounding used in fee calculation to not give an advantage to very small rentals under particular situations (but still under the condition of utilization >= adjusted_utilization).

Deployment Changes

• Deployment Changes

API Changes

• API Changes

Documentation Additions

• Documentation Additions