[Cbc] Wrong objective value of small IP

[John Forrest]

> 
> The files
> 
> Cgl/src/CglTwomir/CglTwomir.hpp
> Cgl/src/CglTwomir/CglTwomir.cpp
> Osi/src/Osi/OsiCuts.hpp
> 
> use DBL_MIN, which is a bit suspicious for me. Doesn't they mean
> -DBL_MAX instead? (DBL_MIN mean the smallest possible _positive_ double
> precision floating point value.)
> 

The use is correct.  The code is initializing the maximum value of an
array and does not want to look at values <= 0.0.