Revert "MPI-aware threading defaults"

[siboehm]

Reverts #198

I think we were not in agreement on whether it was a good change, so it shouldn't have gotten merged (@etuleu approval triggered the automerger).

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.01 ⚠️

Comparison is base (1c1726b) 40.35% compared to head (5dec39b) 40.34%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #200      +/-   ##
==========================================
- Coverage   40.35%   40.34%   -0.01%     
==========================================
  Files          53       53              
  Lines       10223    10222       -1     
==========================================
- Hits         4125     4124       -1     
  Misses       5865     5865              
  Partials      233      233              

Impacted Files	Coverage Δ
axon/threads.go	60.86% <100.00%> (-0.29%)	⬇️

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[rcoreilly]

thanks!