Log Message:
sfeed: Update to 1.3

Changes:
Fixes
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* Fix a compiler warning with some curses implementations, like NetBSD curses.
* sfeed_curses: add keybinds for the home key and the default home and end key
  for urxvt.
* sfeed_curses: fix a redraw when reloading a file with a feed file read from
  stdin and using an URL file and changing this URL file externally.
* sfeed_curses: cast character for SFEED_AUTOCMD to unsigned char to allow
  character sequences outside the ASCII range.

Documentation
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* README: add an example script to count new and unread items. This can be
  useful for some statusbar indicator (asked about by e-mail).
* Small code-style, comments and documentation improvements and fixes.