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Commit from logg (2005-09-08 04:25 CEST)
----------------

Add preliminary set of new operators (very basic and not fully developed),
including grad() and div(). Poisson can now be written as

    a = dot(grad(v), grad(u))*dx

Need to fix computation of gradients of vector-valued functions.

  ffc  src/demo/Poisson.form              1.16
  ffc  src/ffc/compiler/compiler.py       1.21
  ffc  src/ffc/compiler/elementtensor.py  1.13
+ ffc  src/ffc/compiler/operators.py      1.1
  ffc  src/ffc/compiler/reorder.py        1.4
  ffc  src/reference/Poisson.h            1.17