[Cbc] Getting information from running model in CbcMain1

[acw at ascent.com]

We have a Cbc application modeled on Cbc/examples/driver4.cpp; in 
particular, it uses the function CbcMain1 to actually launch the solution.

In a previous version of the same application, we mimicked something much 
simpler, more like driver1.cpp.  In that version, we were able to monitor 
the problem as it was being solved.  We used calls like 
CbcModel->getObjValue() in another thread to watch the objective 
improving.  (We are aware of thread hazards, but we were pretty careful to 
protect ourselves from them.)

When we switched to the driver4-like approach, this stopped working. 
CbcMain1 makes its own copy of the given Cbc model, and it is on this copy 
(called "cbcModel" in the code, which is in CbcSolver.cpp) that 
CbcModel.branchAndBound() is actually invoked.  Poking the original model 
to find out its best objective so far, or the number of nodes it has 
processed, doesn't work.

Is there a right way to expose this copied model so that outside code can 
query its progress?  I'm reluctant to mess around with the code in 
CbcSolver.cpp, but will do that if I have to.
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