stubbed out min-s-t-cut
first pass min-s-t-cut
stubbed out min-cut (bug in min-s-t-cut)
assertions instead of errors
simple dot visualization
eval-when to define reader-macros on compilation
print edge labels in dot representations
debugging on min-s-t-cut

  (the issue is in merge-nodes)
edge hashes now use appropriate custom test
setf methods for `nodes' and `edges'
starting to work on merge-nodes