Fixed sign issue in MDI with forces and stress

[paulsaxe]

• Fixed the sign issue in MDI for forces and stresses
• Avoiding a bug in MDI unit conversion. The bug in MDI is now fixed, but the change is safe and clear and MDI may not have been released.

Status

• Ready for merge

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.56%. Comparing base (0526912) to head (0c2880b).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #316   +/-   ##
=======================================
  Coverage   69.56%   69.56%           
=======================================
  Files         339      339           
  Lines       76184    76184           
=======================================
  Hits        52998    52998           
  Misses      23186    23186           

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