Fenics-ffcx

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- CMake config improvements

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- Some tweaks of installation

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- Make SWIG version >= 2.0 a requirement
- Add possibility to set swig binary and swig path
- Add missing const for map_{from,to}_reference_cell

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- Add quadrature version of tabulate_tensor
- Add finite_element::map_{from,to}_reference_cell
- Add finite_element::{topological,geometric}_dimension
- Add dofmap::topological_dimension
- Rename num_foo_integrals --> num_foo_domains
- Rename dof_map --> dofmap
- Add finite_element::create
- Add dofmap::create

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- Rename and modify a number of UFC interface functions. See docstrings in ufc.h for details.
- Bump required SWIG version to 3.0.3
- Disable dual basis (tabulate_coordinates and evaluate_dofs) for enriched
elements until correct implementation is brought up

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- Remove FErari support
- Add support for new integral type custom_integral
- Support for new form compiler backend "uflacs", downloaded separately