We should add tests for the different features

[giadarol]

Features that should be covered

• Different parallelisation modes: MPI, multiprocessing, serial
• Footprint
• Octupoles (there is something but no quantitative check)
• Chromaticity
• e-cloud
  • Dipole
  • Quadrupole
  • Drifts
  • Kicks defined by optics
• Optics checks (smooth and non-smooth)
  • Possibly a script that generates pkl from optics (should we keep pickles)
• Aperture