getDTthreads MIN(OMP_NUM_THREADS, OMP_THREAD_LIMIT)

[mattdowle]

Closes #3300

[codecov]

Codecov Report

Merging #3390 into master will not change coverage.
The diff coverage is 50%.

@@           Coverage Diff           @@
##           master    #3390   +/-   ##
=======================================
  Coverage   95.09%   95.09%           
=======================================
  Files          65       65           
  Lines       12120    12120           
=======================================
  Hits        11526    11526           
  Misses        594      594

Impacted Files	Coverage Δ
src/openmp-utils.c	88.57% <50%> (ø)	⬆️

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[codecov]

Codecov Report

Merging #3390 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #3390      +/-   ##
==========================================
+ Coverage   95.09%   95.11%   +0.01%     
==========================================
  Files          65       65              
  Lines       12120    12118       -2     
==========================================
  Hits        11526    11526              
+ Misses        594      592       -2

Impacted Files	Coverage Δ
src/openmp-utils.c	93.93% <100%> (+5.36%)	⬆️

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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