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Commit from logg (2005-05-23 18:23 CEST)
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Suggestions for changes

I updated the TODO list with two suggested changes for FFC.
Tell me what you think.

1. Projections
--------------

I'm thinking of adding projections to the language. A simple example:

    P0 = FiniteElement("Discontinuous vector Lagrange", "tetrahedron", 0)
    pi = Projection(P0)

pi would then be a projection onto piecewise constants.

This could be used to reduce the complexity of evaluating certain forms.
If w is a Function, one can replace w with its projection in a form:

    a = pi(w)*u.dx(i)*v.dx(i)*dx

2. Change .dx() --> .Dx()
-------------------------

Ridg suggested changing the notation for derivatives from .dx() to .Dx()
to avoid confusion with the integration operator *dx. What do you think?
Poisson would then change from

    a = u.dx(i)*v.dx(i)*dx

to

    a = u.Dx(i)*v.Dx(i)*dx

  ffc  TODO  1.34