viz framework allows setting nPaths
   This reverts commit 6682efe3e9c066aa648a6eb4a5d2cfdf870e235d.
   stub of continue button
   paths panel
   reducing verbosity of path printing
   click on the path list to get a different path
   path state list printed to scroll panel
   more informative string in the path list panel
   factor edge-highlighting code out so we can re-use it for visualizing path segments
   path segment highlighting is green and thick
   don't automatically choose a path. This is buggy.
   monster draw method chopped up into several smaller methods
toggle different map layers
towards showing a growing trunkiness tree
  every frame pop some number of trunks from the queue until time runs out
changed variable names for clarity
build a tree using the traverse visitor
fix null pointer exceptions
implement recursive weight-setting algorithm
spt draws after path search done