sfeed_update improvements

- Better checking and verbose logging (on failure) of each stage:
  fetchfeed, filter, merge, order, convertencoding. This makes sure on out-of-memory,
  disk-space or other resource limits the output is not corrupted.
  - This also has the added advantage it runs less processes (piped) at the same
    time.
  - Clear previous unneeded file to preserve space in /tmp
    (/tmp is often mounted as mfs/tmpfs).
- Add logging function (able to override), use more logical logging format (pun
  intended).
- Code-style: order overridable functions in execution order.

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