[Dip] Phase 1 Bound history

[kim]

I can easily access the phase 2 bound history easily through the 
m_nodeStats member of the DecompAlgo class, but is the phase 1 bound 
history recorded and accessible anywhere?

I realize the bounds of the phase 1 problem are not directly useful for 
problem solving, but I think I am generating phase 1 problems with a lot 
of degeneracy in them and would like to plot the bound history for 
confirmation.

- Kim