Log Message:
sfeed: Update to 1.0

Changes:
1.0
---
* Performance: enable unlocked I/O by default improving read performance.
* Makefile: switch to use CPPFLAGS -D_DEFAULT_SOURCE preventing warning
  messages on some systems.

* sfeed:
  * Fix regression with parsing RSS guid, by default ispermalink="true".
  * Detect the proper mime-type for XHTML (application/xhtml+xml).
  * Support short digit years for RSS pubDate fields (specified in obsoleted
    RFC822).
  * Improve content-type "type" attribute handling/buffering.
  * Improve "ispermalink", "rel" and "type" \ 
attribute handling/buffering.
  * Add support time fields for old/legacy Atom 0.3 feeds.
* sfeed_frames/sfeed_html: show the total counts and improve the title format
  to match the sfeed_curses title.
* sfeed_gopher: unveil: show path when it failed (OpenBSD).
* sfeed_mbox: add environment variable to print content (off by default because
  it can be insecure for some clients).
* sfeed_update: fix message when the configuration file does not exist yet.
* Portability and standards: add BSD-like err() and errx() functions.
* Code-style improvements.
* Documentation improvements: add examples, fix typos, etc.
* README: update newsboat export script to support the content-type field
  which is added in newer newsboat versions.