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Commit from logg (2005-09-20 17:15 CEST)
----------------

Add mixed formulation of Stokes to the set of demo forms:

P1 = FiniteElement("Lagrange", "triangle", 1)
P2 = FiniteElement("Vector Lagrange", "triangle", 2)
TH = P2 + P1

(v, q) = BasisFunctions(TH)
(u, p) = BasisFunctions(TH)

f = Function(P2)

a = (dot(grad(u), grad(v)) - p*div(v) + div(u)*q)*dx
L = dot(f, v)*dx

  ffc  src/demo/Poisson.form        1.20
  ffc  src/demo/PoissonSystem.form  1.6
+ ffc  src/demo/Stokes.form         1.1