Match the Loan's attribute name.
Remove unused methods and make #min_months a little more readable.
Move changing a loan's business name to the data corrections screen.
Combine extending/decreasing a loan's repayment duration into a single loan change class.
Modify loan changes screen to work with new structure.
Separate class for lump sum repayments.
BLAH
Initialise a LoanChangePresenter with a loan as it always requires one and will build various objects from it.
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Add premium regeneration fields to the loan change form and automatically generate a new schedule on submit.
Ensure repayment_duration is kept within valid constraints.
Add loan change presenter for reprofiling draws.
Move satisfying lender demand state to a separate screen and don't allow changes to be made to lender_demand loans.