Ubercart Percent Rate with Minimum Rate

Clone of the core Ubercart "Flatrate" shipping quote module and the Percentrate module, modified to calculate shipping cost as a base rate on percentage of the order total with minimum shipping rate.

Here's an example on how the module work:

price of product : $ 10
Shipping to location A : 10% of cost or subject to minimum of $ 3.5, free with order above $50
Shipping to location B : 20% of cost or subject to minimum of $ 5.5 free with order above $100
Shipping to location C : 30% of cost or subject to minimum of $ 6.0 free with order above $200

result :

Shipping to A : $ 3.5
Shipping to B : $ 5.5
Shipping to C : $ 6.0

if product cost is $ 40

Shipping to A : $ 4 (as 4 > 3.5)
Shipping to B : $ 8 (as 8 > 5.5)
Shipping to C : $ 12 (12> 6)

if product cost $ 55

Shipping to A : $ FREE
Shipping to B : $ 8 (as 8 > 5.5)
Shipping to C : $ 12 (12> 6)

there are 3 variable need to setup in the admin page :

1 ) Min % rate
2) Min $ rate
3) Free rate for total order above $ x