First test already running again after Constant-ripout, but 
differentiation still buggy.

Rewrote mappers to new recursion scheme.

Halfway through removing Constants
Polynomial and Rational are Expression instances.

Fixed differentiation by a subscripted quantity.

Forgotten debug output killed.

Operator precedence known to output, eliminate "parameters" on differentiation

Made parser understand both 2. and .2

tag of inform@tiker.net--iam-2005/pymbolic--mainline--1.0--patch-26

Added a Vector type.

Picklability of compiled functions.

Fixes.

Towards a usable Fempy

Made compiler usable.

compiler work

Back to working order

Many improvements

Most stuff working again

Added inventory to suppress "build" message.

Completed Rational.

Continuous work...

Fixed compile errors.

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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