Throw an error if plotID (used in a plotGrid) is not unique

[Felixmil]

fixes #566

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (4b171d0) 84.40% compared to head (6175c19) 84.46%.
Report is 4 commits behind head on main.

❗ Current head 6175c19 differs from pull request most recent head 69079c5. Consider uploading reports for the commit 69079c5 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #568      +/-   ##
==========================================
+ Coverage   84.40%   84.46%   +0.06%     
==========================================
  Files          30       30              
  Lines        1827     1835       +8     
==========================================
+ Hits         1542     1550       +8     
  Misses        285      285              

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[PavelBal]

Also field name in the sheet plotGrids