The mortgage calculation example

I used the example of the Canadian mortgage calculation formula as a complex formula whose calculation could demonstrate a variety of Python language features.

Here are the versions produced/shown in class:

mort1.py: the big nasty formula. No good.
mort2.py: Giving names to portions of the formula results in a readable program.
mort3.py: Putting it in a procedure.
mort4.py: A parameterized procedure, which is more useful than the mort3 version.
mort5.py: A procedure which returns a value instead of printing, so that the procedure call is an expression rather than a statement.

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