added new data-structures

added new test-cases
added flexible dijkstra calculation
added debugging log
modified: plotting, grid-generation, grid-importance,
refactoring

tests/grid/GridImportance.cpp

@@ -22,7 +22,7 @@ TEST(GridImportance, a) {
 	GridImportance gi;
 	gi.addImportance(g, 20);
 
-	plot(g);
+	Plot p; p.build(g).fire();
 
 }