[Cbc] Enabling multithreading with CbcMain1

[acw at ascent.com]

We are trying to enable multithreading in our Cbc-based application.  Our 
application was modeled on Cbc/examples/driver4.cpp, though we use custom 
code to assemble the model, rather than reading from an MPS file.

We are seeing an exception and process quit in our early attempts to 
specify the thread count.

The important bit is:

const char * argv2[ ] = {"driver3", "-threads", "0", "-solve", "-quit"};
CbcMain1(5, argv2, modelA, callBack);

The failure definitely occurs after control is handed to CbcMain1.  Have 
we specified argv2 wrongly?  I just noticed that we got the command name 
wrong ("driver3") but I'm pretty sure this "zeroth" argument is ignored by 
CbcMain1.

My understanding is that "-threads 0" disables multithreading in the 
command-line interface; we were just testing the syntax before trying to 
enable multithreading.

Thanks for your assistance.
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