09_git.ipynb: Put _repo_graph_savefile() in a separate cell

This would make it easier to split off all that is not git specific
to a separate 10_checkpoint.ipynb notebook.

Author: jnareb

09_git.ipynb

@@ -1160,8 +1160,16 @@
     "\n",
     "def _out_basename(graph_name, out_dir='datasets'):\n",
     "    return _savefile_name(graph_name, out_dir=out_dir, kind=None, file_format=None)\n",
-    "\n",
-    "\n",
+    "\n"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "#export\n",
     "def _repo_graph_savefile(repo_path, out_dir='datasets'):\n",
     "    \"\"\"Create filename for storing adjacency list out of repository path\n",
     "\n",