Can draw all the lines of the tree

testings/testing_treedraw.c

@@ -50,6 +50,12 @@ main(int argc, char ** argv)
         x2 = 50 + 50*tiles[i];
         libhqr_drawline(x1, y1, x2, y2, tree);
     }
+    for ( int i = 1; i < maxMN; i++){
+        x1 = x2 = 50 + 50*tiles[i];
+        y1 = 50 + 50 * i;
+        y2 = 50 + 50 * (qrtree.currpiv(&qrtree, 0, i));
+        libhqr_drawline(x1, y1, x2, y2, tree);
+    }
     libhqr_writeend(tree);
     free(tree);
     return 1;