[Cbc] Constraint Violation in Cbc 2.8.7

[Matthew Gidden]

Hi folks,

I am running into an issue where Cbc reports an optimal solution with a
constraint being violated. I explain the issue in more detail and provide
an MPS input file here <https://gist.github.com/gidden/238bf48db399f8e58fb7>.
In short, I observe a constraint violation of ~3.5% which is affecting the
results of my test suite.

My Cbc version is:
```
Welcome to the CBC MILP Solver
Version: 2.8.7
Build Date: Aug  4 2014
Revision Number: 2053
```

I am looking into switching to trunk, but I was curious if anyone else has
experienced similar issues.

Cheers,

-- 
Matthew Gidden, Ph.D.
Postdoctoral Associate, Nuclear Engineering
The University of Wisconsin -- Madison
Ph. 225.892.3192
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