compute layered vs non-layered SPC/WPC geometries

[akrherz]

refs #738

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (9ca5ed6) 97.62% compared to head (6bafd02) 97.63%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #739   +/-   ##
=======================================
  Coverage   97.62%   97.63%           
=======================================
  Files          79       79           
  Lines        9510     9546   +36     
=======================================
+ Hits         9284     9320   +36     
  Misses        226      226           

Impacted Files	Coverage Δ
src/pyiem/models/taf.py	100.00% <100.00%> (ø)
src/pyiem/nws/products/_outlook_util.py	100.00% <100.00%> (ø)
src/pyiem/nws/products/ero.py	100.00% <100.00%> (ø)
src/pyiem/nws/products/spcpts.py	100.00% <100.00%> (ø)

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