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Changes in version 2017.2.0
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FFC 2017.2.0 was released on 2017-09-19.

Summary of changes
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- Some fixes for ufc::eval for esoteric element combinations
- Reimplement code generation for all ufc classes with new class
  ufc::coordinate_mapping which can map between coordinates, compute
  jacobians, etc. for a coordinate mapping parameterized by a specific
  finite element.
- New functions in ufc::finite_element:
  - evaluate_reference_basis
  - evaluate_reference_basis_derivatives
  - transform_reference_basis_derivatives
  - tabulate_reference_dof_coordinates
- New functions in ufc::dofmap:
  - num_global_support_dofs
  - num_element_support_dofs
- Improved docstrings for parts of ufc.h
- FFC now accepts Q and DQ finite element families defined on quadrilaterals and hexahedrons
- Some fixes for ufc_geometry.h for quadrilateral and hexahedron cells
