Unit test for boundary conditions of a 1D cell using 3D simulation

[oskooi]

Adds a unit test for boundary conditions of a 1D cell using a 3D simulation. Based on the example in Tutorial/Antenna above a Perfect Electric Conductor Ground Plane.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.89%. Comparing base (f29a8c7) to head (c001674).
⚠️ Report is 94 commits behind head on master.
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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3121      +/-   ##
==========================================
+ Coverage   73.81%   73.89%   +0.08%     
==========================================
  Files          18       18              
  Lines        5423     5452      +29     
==========================================
+ Hits         4003     4029      +26     
- Misses       1420     1423       +3     

see 2 files with indirect coverage changes

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