Merge branch 'develop'

README.rst

bfps/NavierStokes.py

bfps/__init__.py

bfps/base.py

bfps/code.py

bfps/cpp/Lagrange_polys.cpp

bfps/cpp/Lagrange_polys.hpp

bfps/cpp/base.hpp

bfps/cpp/fluid_solver.cpp

bfps/cpp/fluid_solver.hpp

bfps/cpp/fluid_solver_base.cpp

bfps/cpp/interpolator.cpp

bfps/cpp/interpolator.hpp

bfps/cpp/particles.cpp

bfps/cpp/particles.hpp

bfps/cpp/slab_field_particles.cpp

bfps/cpp/slab_field_particles.hpp

bfps/cpp/spline_n1.cpp

bfps/cpp/spline_n2.cpp

bfps/cpp/spline_n3.cpp