Fenics-ufl

- Add script ufl-version
- Added syntax for associating an arbitrary domain data object with a measure:
dss = ds[boundaries]; M = f*dss(1) + g*dss(2)
- Added new operators elem_mult, elem_div, elem_pow and elem_op for
elementwise application of scalar operators to tensors of equal shape
- Added condition operators And(lhs,rhs) and Or(lhs,rhs) and Not(cond)
- Fixed support for symmetries in subelements of a mixed element
- Add support for specifying derivatives of coefficients to derivative()

- Remove set_foo functions in finite element classes
- Change license from GPL v3 or later to LGPL v3 or later
- Change behavior of preprocess(), form.compute_form_data(), form_data.preprocessed_form
- Allowing grad, div, inner, dot, det, inverse on scalars
- Simplify Identity(1) -> IntValue(1) automatically
- Added Levi-Cevita symbol: e = PermutationSymbol(3); e[i,j,k]
- Fix bug with future division behaviour (ufl does not support floor division)
- Add subdomain member variables to form class
- Allow action on forms of arbitrary rank

- Allow jump(Sigma, n) for matrix-valued expression Sigma
- Bug fix in scalar curl operator
- Bug fix in deviatoric operator

- Bug fixes in PartExtracter
- Do not import x for coordinate
- Add Circumradius to Cell (Cell.circumradius)
- Add CellVolume to Cell (Cell.volume)

- Rename ElementRestriction --> RestrictedElement
- Experimental import of x from tetrahedron
- Make lhs/rhs work for resrictions
- Redefine operator + for FiniteElements and replace + by *
- Rename ElementUnion -> EnrichedElement
- Add support for tan() and inverse trigonometric functions

- Attach form data to preprocessed form, accessible by form.form_data()