[Cbc] Getting node info in Cgl cut

[Fei Peng]

Hi Cbc community,

I have a question about writing custom Cgl cuts with Cbc: things that 
get passed to CglCutGenerator when invoking generateCuts include an 
OsiSolverInterface, the set of cuts, and a CglTreeInfo. However, this 
doesn't allow me to get the current node information in a custom Cgl cut 
(which inherets CglCutGenerator). The only thing a Cgl generator knows 
is the level of the node where it's invoked, but not the specific node.

The reason I'm asking is I have some global information that was derived 
higher in the tree (that I'll store in the random cut), which can be 
used down at children nodes to generate cuts. walkback_ in CbcModel sort 
of includes the trace all the way to the top, but again without knowing 
which node I'm at, there's no way to start the walkback. I wonder if 
there's a way of getting this information without modifying 
CbcCutGenerator etc.?

Thanks!
Fei