Fixed leftover fempy name in setup.py.

Added setup.py

Deleted lex.py for move to tools.

Build more.

Arch Inventory in mapper/ subdir.

Try to get this back in shape.

Forgot directory

Polynomial refactoring, mapper move.

Forgot new tests file.

Primitives fixed.

Simple fixes for mapper and parser.

Finished Differentiator.

Differentiator almost complete

initial import

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