Added in BFS for global relabeling.  The NodeQ should be moved to Node.nw, and BFS should be used for init too. Added debugging code trying to figure out why we are missing mergers with nodes labeled l-2.  Added kludge to merge with any node with label <= l-1.  Still has too much debugging printing in it.
Added in BFS for global relabeling.  The NodeQ should be moved to Node.nw,
and BFS should be used for init too.
Added debugging code trying to figure out why we are missing mergers
with nodes labeled l-2.  Added kludge to merge with any node with
label <= l-1.  Still has too much debugging printing in it.

cander/pseudoflow-solver,cander/pseudoflow-solver