Add variable bounds to incoming states in LagrangianDuality

[odow]

Closes #818

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.35%. Comparing base (aec55e2) to head (2bb0a1a).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #819      +/-   ##
==========================================
+ Coverage   96.28%   96.35%   +0.06%     
==========================================
  Files          26       26              
  Lines        3527     3593      +66     
==========================================
+ Hits         3396     3462      +66     
  Misses        131      131              

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[odow]

I still need to add possible integrality restrictions.