Merge branch 'IncompressibleCumulants' into 'master'

Fix minor issues and remove depricated usage of cumulant LB method

See merge request !70
8 jobs for release/0.3.2 in 16 minutes and 18 seconds (queued for 3 seconds)
latest
Name Stage Failure
failed
minimal-windows Test
..\..\..\..\..\..\users\build\miniconda3\envs\pystencils\lib\site-packages\pyximport\pyximport.py:51
c:\users\build\miniconda3\envs\pystencils\lib\site-packages\pyximport\pyximport.py:51: DeprecationWarning: the imp module is deprecated in favour of importlib; see the module's documentation for alternative uses
import imp

-- Docs: https://docs.pytest.org/en/stable/warnings.html
================= xdist: maximum crashed workers reached: 16 ==================
================== 1 warning in 535994.33s (6 days, 4:53:14) ==================
Cleaning up file based variables
ERROR: Job failed: Process exited with status 1