change threading station structure

[akrherz]

closes #645

[codecov]

Codecov Report

Merging #646 (77fd57e) into main (fe2298e) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #646      +/-   ##
==========================================
- Coverage   96.85%   96.85%   -0.01%     
==========================================
  Files          78       78              
  Lines        9157     9156       -1     
==========================================
- Hits         8869     8868       -1     
  Misses        288      288              

Impacted Files	Coverage Δ
src/pyiem/network.py	100.00% <100.00%> (ø)

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