Update Optim to v2

[baggepinnen]

Needs LeastSquaresOptim to update as well

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.04%. Comparing base (ebfb4e7) to head (5690c83).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #191   +/-   ##
=======================================
  Coverage   89.04%   89.04%           
=======================================
  Files          14       14           
  Lines        2418     2418           
=======================================
  Hits         2153     2153           
  Misses        265      265           

Flag	Coverage Δ
unittests	89.04% <100.00%> (ø)

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