Loans/equity: new page for sending & logging various email communications.
Revised promissory note includes two copies of the note plus a loan
schedule. Idea is there's only one document to print.
Main page enforces default interest rates as maximums; users can only
select a lower amount. Zero is also enforced as a floor.
Payoffs table has a new flag for when the check is actual issued
vs. just viewed. UI side isn't done yet.
Legacy BUGFIX: table's in a different DB