Fenics-ffcx

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- No changes

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- Forked FFCx

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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

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- Change PyPI package name to fenics-ffc.

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- Let ffc -O parameter take an optional integer level like -O2, -O0
- Implement blockwise optimizations in uflacs code generation
- Expose uflacs optimization parameters through parameter system

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- Jit compiler now compiles elements separately from forms to avoid duplicate work
- Add parameter max_signature_length to optionally shorten signatures in the jit cache
- Move uflacs module into ffc.uflacs
- Remove installation of pkg-config and CMake files (UFC path and
compiler flags are available from ffc module)
- Add dependency on dijitso and remove dependency on instant
- Add experimental Bitbucket pipelines
- Tidy the repo after UFC and UFLACS merge, and general spring cleanup. This
includes removal of instructions how to merge two repos, commit hash
c8389032268041fe94682790cb773663bdf27286.