Merge branch 'feature/refactor-particles' into develop

CMakeLists.txt

README.rst

TurTLE/TEST.py

TurTLE/_code.py

cpp/field_layout.hpp

cpp/full_code/NSVE_Stokes_particles.cpp

cpp/full_code/NSVEcomplex_particles.cpp

cpp/full_code/test_tracer_set.cpp

cpp/full_code/test_tracer_set.hpp

cpp/particles/abstract_particle_rhs.hpp

cpp/particles/abstract_particles_input.hpp

cpp/particles/abstract_particles_output.hpp

cpp/particles/inner/particles_inner_computer.cpp

cpp/particles/inner/particles_inner_computer.hpp

cpp/particles/inner/particles_inner_computer_2nd_order.hpp

cpp/particles/inner/particles_inner_computer_empty.hpp

cpp/particles/interpolation/Lagrange_polys.cpp

cpp/particles/interpolation/Lagrange_polys.hpp

cpp/particles/interpolation/abstract_particle_set.hpp

cpp/particles/interpolation/field_tinterpolator.cpp