- corrected sorting 0.2.10 > 0.2.2

- tests are run in parallel to other jobs
  -> makes no sense to do performance testing there
  -> assertion randomly fails

in unit testing without display plots, the same figure would be used
over and over again. This is problematic when mixing 3D and 2D axes

- stencil plotting & transformation now in ps.stencil
- additional documentation & notebooks

- typos, more content
- added numba to benchmark comparison