LOAN_PAY - Calculate loan payment Schedule

This function is useful for estimating payments for uniform payment schedules for such items as car loans and house mortgages.

The schedules include the amount of remaining debt , the interest for the current period.

    Two rules are available:
  1. using the Capital Recovery Factor which pays the interest and some of the debt with every period.
  2. The 'RULE of 78' that is used by some lending institutions to load the interest repayments to the front end of the series and that causes the debt to increase in the early part of the series.

End to date, ams 990712