2.16.1

• bugfix in Projective Fluids solver (thanks to Lukas Hof)
• added implementation of turbulence method: Liu et al., "Turbulent Details Simulation for SPH Fluids via Vorticity Refinement", Computer Graphics Forum, 2021
• Scene files now have a namespace for each pressure and non-pressure solver. This means existing scene files have to be adapted (see doc/file_format.md).
• fixed some bugs in the elasticity solvers
• deactivated avx in Linux wheels due to problems