python: render <svg> via _repr_html_

Work around a recent decision in Jupyter Lab and Notebook to render
<svg> is inline <img>, breaking tooltips or text selection.

(Rerendering all notebooks was painful.)

* NEWS: Mention the change.
* python/spot/__init__.py: Add a _repr_html_ method to all
classes that had a _repr_svg_.  It seems Jupyter will use
_repr_html_ by default.
* python/spot/jupyter.py: SVG replace the _repr_svg_ method
by a _repr_html.
* tests/python/_altscc.ipynb, tests/python/_autparserr.ipynb,
tests/python/_aux.ipynb, tests/python/_mealy.ipynb,
tests/python/_partitioned_relabel.ipynb,
tests/python/_product_susp.ipynb, tests/python/_product_weak.ipynb,
tests/python/_synthesis.ipynb, tests/python/aliases.ipynb,
tests/python/alternation.ipynb, tests/python/atva16-fig2a.ipynb,
tests/python/atva16-fig2b.ipynb, tests/python/automata-io.ipynb,
tests/python/automata.ipynb, tests/python/cav22-figs.ipynb,
tests/python/contains.ipynb, tests/python/decompose.ipynb,
tests/python/formulas.ipynb, tests/python/games.ipynb,
tests/python/gen.ipynb, tests/python/highlighting.ipynb,
tests/python/ltsmin-dve.ipynb, tests/python/ltsmin-pml.ipynb,
tests/python/parity.ipynb, tests/python/product.ipynb,
tests/python/randaut.ipynb, tests/python/satmin.ipynb,
tests/python/stutter-inv.ipynb, tests/python/synthesis.ipynb,
tests/python/testingaut.ipynb, tests/python/twagraph-internals.ipynb,
tests/python/word.ipynb, tests/python/zlktree.ipynb: Update all
notebooks.

tests/python/_aux.ipynb

@@ -37,8 +37,8 @@
      "traceback": [
       "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
       "\u001b[0;31mCalledProcessError\u001b[0m                        Traceback (most recent call last)",
-      "\u001b[0;32m<ipython-input-2-877ef1b1c636>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m()\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0mspot\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0maux\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mstr_to_svg\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34mb'syntax error'\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
-      "\u001b[0;32m/home/adl/git/spot/python/spot/aux.py\u001b[0m in \u001b[0;36mstr_to_svg\u001b[0;34m(str)\u001b[0m\n\u001b[1;32m     62\u001b[0m     \u001b[0mret\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0mdot\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mwait\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m     63\u001b[0m     \u001b[0;32mif\u001b[0m \u001b[0mret\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m---> 64\u001b[0;31m         \u001b[0;32mraise\u001b[0m \u001b[0msubprocess\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mCalledProcessError\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mret\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0;34m'dot'\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m     65\u001b[0m     \u001b[0;32mreturn\u001b[0m \u001b[0mstdout\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mdecode\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m'utf-8'\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m     66\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n",
+      "Cell \u001b[0;32mIn[2], line 1\u001b[0m\n\u001b[0;32m----> 1\u001b[0m \u001b[43mspot\u001b[49m\u001b[38;5;241;43m.\u001b[39;49m\u001b[43maux\u001b[49m\u001b[38;5;241;43m.\u001b[39;49m\u001b[43mstr_to_svg\u001b[49m\u001b[43m(\u001b[49m\u001b[38;5;124;43mb\u001b[39;49m\u001b[38;5;124;43m'\u001b[39;49m\u001b[38;5;124;43msyntax error\u001b[39;49m\u001b[38;5;124;43m'\u001b[39;49m\u001b[43m)\u001b[49m\n",
+      "File \u001b[0;32m~/git/spot/python/spot/aux_.py:90\u001b[0m, in \u001b[0;36mstr_to_svg\u001b[0;34m(str)\u001b[0m\n\u001b[1;32m     88\u001b[0m ret \u001b[38;5;241m=\u001b[39m dot\u001b[38;5;241m.\u001b[39mwait()\n\u001b[1;32m     89\u001b[0m \u001b[38;5;28;01mif\u001b[39;00m ret:\n\u001b[0;32m---> 90\u001b[0m     \u001b[38;5;28;01mraise\u001b[39;00m subprocess\u001b[38;5;241m.\u001b[39mCalledProcessError(ret, \u001b[38;5;124m'\u001b[39m\u001b[38;5;124mdot\u001b[39m\u001b[38;5;124m'\u001b[39m)\n\u001b[1;32m     91\u001b[0m out \u001b[38;5;241m=\u001b[39m stdout\u001b[38;5;241m.\u001b[39mdecode(\u001b[38;5;124m'\u001b[39m\u001b[38;5;124mutf-8\u001b[39m\u001b[38;5;124m'\u001b[39m)\n\u001b[1;32m     92\u001b[0m \u001b[38;5;28;01mreturn\u001b[39;00m svgscale_regex\u001b[38;5;241m.\u001b[39msub(_gvfix, out)\n",
       "\u001b[0;31mCalledProcessError\u001b[0m: Command 'dot' returned non-zero exit status 1."
      ]
     }
@@ -46,11 +46,18 @@
    "source": [
     "spot.aux.str_to_svg(b'syntax error')"
    ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
   }
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 3",
+   "display_name": "Python 3 (ipykernel)",
    "language": "python",
    "name": "python3"
   },
@@ -64,7 +71,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.6.4"
+   "version": "3.11.7"
   }
  },
  "nbformat": 4,