Fix sigma/omgea parse with boundaries

[mattfidler]

No description provided.

[codecov]

Codecov Report

Patch coverage: 97.72% and project coverage change: +0.04 🎉

Comparison is base (cef6736) 90.66% compared to head (2d774d7) 90.70%.

❗ Current head 2d774d7 differs from pull request most recent head 6aab736. Consider uploading reports for the commit 6aab736 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #152      +/-   ##
==========================================
+ Coverage   90.66%   90.70%   +0.04%     
==========================================
  Files          52       53       +1     
  Lines        6342     6383      +41     
==========================================
+ Hits         5750     5790      +40     
- Misses        592      593       +1     

Impacted Files	Coverage Δ
R/sub.R	89.18% <ø> (-0.82%)	⬇️
R/advan5.R	96.66% <96.66%> (ø)
R/nonmem2rx.R	85.54% <100.00%> (+0.11%)	⬆️
src/abbrev.c	96.96% <100.00%> (+<0.01%)	⬆️
src/omega.c	97.42% <100.00%> (+0.02%)	⬆️
src/util.cpp	92.53% <100.00%> (+0.12%)	⬆️

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