sfeed_curses: Update to 0.9.9

Changes:
0.9.9
-----
- mark as read: use the ID if the link is empty
- sfeed_content: fix unescaping function
- Add feature to process a sequence of keys automatically on startup via
  $SFEED_AUTOCMD environment variable
- Add horizontal and monocle layout
- Misc bugfixes and improvements

(leot)