Default fee & repayment grace period

[krosza]

Proposal: dailly 1 thousandth of the amount due, from the maturity day after, reason: the outstanding due and not repaid cause an inflationary push.User must have incentive to be punctual. The default fee equal with the accrued thousandth during the grace period.

[szerintedmi]

Repayment grace period has been removed, only maturity is stored. User can repay anytime before maturity.
On UI any loan can be repayed before maturity but we display "due" 2 days (can be changed) before maturity