Improved OpenMP support

[llaniewski]

This PR improved the OpenMP support and introduces --cpu-layout option for better performance on CPUs.

[codecov-commenter]

Codecov Report

Patch coverage: 88.23% and project coverage change: +0.12% 🎉

Comparison is base (769d4b7) 43.98% compared to head (7b97a30) 44.10%.
Report is 1 commits behind head on develop.

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #443      +/-   ##
===========================================
+ Coverage    43.98%   44.10%   +0.12%     
===========================================
  Files          166      166              
  Lines         7801     7818      +17     
===========================================
+ Hits          3431     3448      +17     
  Misses        4370     4370              

Flag	Coverage Δ
d2q9	30.55% <80.00%> (+0.15%)	⬆️
d2q9_bc	26.82% <73.33%> (+0.15%)	⬆️
d2q9_kuper	27.52% <73.33%> (+0.15%)	⬆️
d3q27_PSM_NEBB	35.72% <86.66%> (+0.12%)	⬆️
d3q27_pf_velocity	30.47% <82.35%> (+0.15%)	⬆️

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Files Changed	Coverage Δ
src/LatticeContainer.h.Rt	83.33% <ø> (ø)
src/LatticeContainer.inc.cpp.Rt	58.38% <0.00%> (ø)
src/Lattice.cu.Rt	46.38% <50.00%> (+0.09%)	⬆️
src/cross.h	94.73% <100.00%> (+24.73%)	⬆️

... and 3 files with indirect coverage changes

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