Develop to Master merge, release v6.8.3

[alexskr]

includes:

• Upgrade owlapi_wrapper JAR to 1.5.1 #267

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.11%. Comparing base (3f042f0) to head (89e981c).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #268      +/-   ##
==========================================
- Coverage   80.13%   80.11%   -0.02%     
==========================================
  Files          84       84              
  Lines        5880     5880              
==========================================
- Hits         4712     4711       -1     
- Misses       1168     1169       +1     

Flag	Coverage Δ
unittests	80.11% <100.00%> (-0.02%)	⬇️

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