[GL] SurfaceGrid: Rm friend class, abort on error.

GeoLib/SurfaceGrid.cpp

@@ -120,10 +120,11 @@ void SurfaceGrid::sortTrianglesInGridCells(Surface const*const sfc)
 			Point const& p0(*((*sfc)[l]->getPoint(0)));
 			Point const& p1(*((*sfc)[l]->getPoint(1)));
 			Point const& p2(*((*sfc)[l]->getPoint(2)));
-			DBUG("Sorting triangle %d [(%f,%f,%f), (%f,%f,%f), (%f,%f,%f) into "
+			ERR("Sorting triangle %d [(%f,%f,%f), (%f,%f,%f), (%f,%f,%f) into "
 				"grid.",
 				l, p0[0], p0[1], p0[2], p1[0], p1[1], p1[2], p2[0], p2[1], p2[2]
 			);
+			std::abort();
 		}
 	}
 }

GeoLib/SurfaceGrid.h

@@ -34,7 +34,6 @@ public:
 		double eps = std::numeric_limits<double>::epsilon()) const;
 
 private:
-	friend GeoLib::Surface;
 	void sortTrianglesInGridCells(GeoLib::Surface const*const surface);
 	bool sortTriangleInGridCells(GeoLib::Triangle const*const triangle);
 	boost::optional<std::array<std::size_t,3>>