[Cbc] failure on small IP

[Matthew Galati]

Here's another one - using Cbc2.3 stable.

http://coral.ie.lehigh.edu/~magh/tmp/PRICE_AND_CUT_subProb_relax1.n70.c0.p1.b1.lp

Coin Cbc and Clp Solver version 2.3stable, build Sep 25 2009
...
FlowCover was tried 2 times and created 0 cuts of which 0 were active after
adding rounds of cuts (0.001 seconds)
TwoMirCuts was tried 1 times and created 3 cuts of which 0 were active after
adding rounds of cuts (0.000 seconds)
cbc: ../../../Clp/src/ClpPrimalColumnSteepest.cpp:587: virtual int
ClpPrimalColumnSteepest::pivotColumn(CoinIndexedVector*, CoinIndexedVector*,
CoinIndexedVector*, CoinIndexedVector*, CoinIndexedVector*): Assertion
`model_->reducedCost(bestSequence)>0.0' failed.
Aborted
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