[Cbc] a minimal list of class to instanciate before using CBC

[ycollet at freesurf.fr]

Hello,

I am currently experiencing CBC and CLP.
I have tried CBC and it was segfaulting on some instances from miplib.
After some reflexion, I found that I forgot to add some Cbc classes to  
CbcModel.
So, my question is: what is the minimum list of classes to add to CbcModel ?

How many of these classes do I need ?

CbcBranchDecision (??)
CbcProbing (??)
CbcCompare (??)
CbcHeuristic (maybe one is required)
CbcStrategy (maybe optional)
Cgl* (certainly at least one ?)

YC