added some comments

src/quadtree_tool.c

@@ -71,10 +71,12 @@ int main(int argc, char *argv[]) {
 		run_func(matrix_to_quadtree(p_qtree1, &p_pgm1->mat, 0, n_max, p_pgm1->mat.m/2, p_pgm1->mat.m/2, p_pgm1->mat.n/2));
 
 		print_applying("horizontal symmetry qtree1");
-		run_func(quadtree_horizontal_symmmetry(p_qtree1));					            	// symmetry
+		//run_func(quadtree_horizontal_symmmetry(p_qtree1));					            	// symmetry
 
-		//print_applying("horizontal symmetry");
+		//print_applying("vertical symmetry qtree1");
 		//run_func(quadtree_vertical_symmmetry(p_qtree1));					              // symmetry
+
+		//print_applying("central symmetry qtree1");
     //run_func(quadtree_central_symmmetry(p_qtree1));					                // symmetry
 
 		print_applying("compression qtree1");