Renamed SPIP test classes
Worked on improving coloring of monotone pieces

* MonotonePiecesOperation exposes graph of monotone pieces
* MonotonePiecesPanel fetches this to allow better coloring
  in the future
MonotonePiecesPanel uses ColorMapBuilder to assign colors
Considering polygons with common nodes as neighbors for coloring
Using better coloring for monotone triangulation as well
Brighter colors for monotone pieces
White background for various panels