Update mol3D.py

[rolan701]

update roland_combine to better handle aromatics

[codecov]

Codecov Report

❌ Patch coverage is 60.00000% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 39.76%. Comparing base (0130000) to head (5b41e8d).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
molSimplify/Classes/mol3D.py	60.00%	12 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #486   +/-   ##
=======================================
  Coverage   39.75%   39.76%           
=======================================
  Files          93       93           
  Lines       29885    29903   +18     
=======================================
+ Hits        11882    11892   +10     
- Misses      18003    18011    +8     

Flag	Coverage Δ
unittests	39.76% <60.00%> (+<0.01%)	⬆️

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