Repayment schedule rewrite (exact monthly repayments for repay over fixed number of periods) + optional rounding off of repayment amount in repayment schedule #296
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Add checkbox in Loan Product to configure whether to round off (ceil, actually) monthly repayments or not.
Before the option is checked:

After:

Resolves #31
Edit: This started out as a minor fix to the repayment amount in response to #31, but is now far bigger in scope as previously all repayment schedules used the PMT formula and, as a result, the monthly repayment amount came out to be somewhat incorrect.
This PR also attempts to use one single function to calculate interest amounts everywhere.