added new data-structures

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

grid/GridPoint.h

@@ -2,6 +2,7 @@
 #define GRIDPOINT_H
 
 #include <cmath>
+#include "../geo/Point3.h"
 
 struct GridPoint {
 
@@ -35,6 +36,12 @@ struct GridPoint {
 		return std::sqrt(dx*dx + dy*dy + dz*dz) / 100.0f;
 	}
 
+	/** cast to Point3 */
+	operator Point3() const {return Point3(x_cm, y_cm, z_cm);}
+
+	/** cast to string */
+	operator std::string() const {return "(" + std::to_string(x_cm) + "," + std::to_string(y_cm) + "," + std::to_string(z_cm) + ")";}
+
 
 };