[Cbc] wrong objective sign in solution

[victor.zverovich at gmail.com]

Hello,

CBC reports wrong objective sign for the attached problem:

$ cbc test -AMPL
$ head -1 test.sol
CBC 2.8.12 optimal, objective -192000

The correct objective value is 192000. The problem was obtained from the
AMPL model prod0.mod <http://ampl.com/BOOK/EXAMPLES/EXAMPLES2/prod0.mod>.

Here's the original bug report in the AMPL Google Group:
https://groups.google.com/d/msg/ampl/cfkafsdmGMg/Jd5tmc9GPbsJ

Best regards,
Victor
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