- Added a "Download text" preference. Defaults on.
- If on, the text is fetched for feeds that are in text view when fetching new stories.
- The text is fetched after stories, and before images, using a similar mechanism.
- The text is stored in a new "cached_text" database table.
- The text is deleted when the story is deleted.
- When displaying a text view, the cached text is used if available, otherwise it is fetched as before.
