- str(e) did work in previous pytest version
- but the correct usage is str(e.value)
- in newer pytest version the string for the e object is changed so
  the tests did not work any more

Remove obsolete fluctuatinglb.method_with_rescaled_equilibrium_values

See merge request !5

Fluctuating LB needs zero mean and unit variance random numbers

See merge request !4

Magic block offset symbols for Walberla

Closes #2

See merge request !3

- variances from temperature
- seed parameter
- block offset parameter

- typos, more content
- added numba to benchmark comparison

-> replaced by 1e-16

- turned on restrict keyword by default (makes large difference on GPUs)
- smarter block indexing: changing block size depending on domain size
  Example: previously there where (1,1,1) blocks when requested
  block size was (64, 1, 1) and domain size (1, 512, 512), now the
  block size is changed automatically to (1, 64, 1) in this case
- added __lauch_bounds__ to kernels to allow better optimizations from
  the CUDA compiler

- style changes marked by flake
- using newest kerncraft version