[Coin-discuss] Callback for main loop in CbcModel.branchAndBound

[acw at ascent.com]

We have a Cbc application that we have been using happily for a couple of 
years, and recently we decided to refresh our Cbc sources from the 
repository to get the benefit of recent development. (In particular we are 
hoping to exploit parallelization of node processing, but that's a story 
for another time.)

Last time around, I put an inglorious modification into the main loop of 
CbcModel.branchAndBound, adding a check for low memory to the other exit 
checks.  It struck me as I was doing this that there ought to be a user 
callback in the main branch-and-bound loop, so that the user can add code 
that runs once for each processed node.  Modifying CbcModel was not so 
great, because I would have to repeat the modifications every time I 
upgraded our Cbc sources.  Does such a callback function exist, so I can 
just extend the CbcModel class and add my code, so to speak, on the 
outside?
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