Fixes for Export and Describe

1. **Describe** 🐞 - In certain situations Describe would refuse, just utterly refuse, to give you any description whatsoever. So rude. We had a long, hard conversation with Describe and set it straight. 2. **Export** 🐛 - Exported documents would sometimes contain HTML tags or other gobbledygook. And sometimes it would fail completely with longer documents. Now it works quite well even with very, very, very long docs. (We tested with up to 500,000 words.) And the gobbledygook? Gobbledygone. 😬