Nested functions patch

[Max Brister]

Attached is a patch to add support for nested functions along with a
few simple test cases (in test/nest). I tired to keep modifications to
the existing code to a minimum. Basically, I added a new storage class
to symbol_record, nonlocal, to handle variable lookup in nested
functions. My computer also passes the same number of tests with and
without the patch, so I don't think I added too many horrible bugs. I
would appreciate any feedback.

Max Brister

nest.patch
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