Allow disabling basis tabulation

I am working on a Dune backend, which naturally supports quadrilaterals. Unfortunately, I did not find a quick way to disable the parts of ffc that do not (which I do not need anyway). This is a pity, because I really only need ffc as a driver for uflacs...

Traceback (most recent call last):
  File "/home/dominic/generation/uflpdelab/uflpdelab/cmd_compile_pdelab.py", line 109, in <module>
    run_uflpdelab(**vars(args))
  File "/home/dominic/generation/uflpdelab/uflpdelab/cmd_compile_pdelab.py", line 68, in run_uflpdelab
    local_operator_generator = LocalOperator(data, local_operator_file, parameter_class_file)
  File "/home/dominic/generation/uflpdelab/uflpdelab/pdelab/local_operator.py", line 57, in __init__
    ir = get_uflacs_ir(data.forms[0])
  File "/home/dominic/generation/uflpdelab/uflpdelab/pdelab/local_operator.py", line 27, in get_uflacs_ir
    ir = compute_ir(analysis, parameters)
  File "/usr/local/lib/python2.7/dist-packages/ffc/representation.py", line 96, in compute_ir
    for (i, fd) in enumerate(form_datas)]
  File "/usr/local/lib/python2.7/dist-packages/ffc/representation.py", line 220, in _compute_integral_ir
    parameters)
  File "/usr/local/lib/python2.7/dist-packages/ffc/uflacsrepr/uflacsrepresentation.py", line 48, in compute_integral_ir
    tabulate_basis(sorted_integrals, form_data, itg_data)
  File "/usr/local/lib/python2.7/dist-packages/ffc/quadrature/tabulate_basis.py", line 249, in tabulate_basis
    num_derivatives[ufl_element], points)
  File "/usr/local/lib/python2.7/dist-packages/ffc/quadrature/tabulate_basis.py", line 129, in _tabulate_psi_table
    entity_points = _map_entity_points(cellname, tdim, points, entity_dim, entity)
  File "/usr/local/lib/python2.7/dist-packages/ffc/quadrature/tabulate_basis.py", line 91, in _map_entity_points
    return map_facet_points(points, entity)
  File "/usr/local/lib/python2.7/dist-packages/ffc/fiatinterface.py", line 225, in map_facet_points
    coordinates = [vertex_coordinates[v] for v in facet_vertices[facet]]
KeyError: 4

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